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annotate MetroWpf/MetroWpf.Framework/Extensions/StringExtensions.cs @ 47:376c72183392

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author Steven Hollidge <stevenhollidge@hotmail.com>
date Fri, 06 Apr 2012 23:09:53 +0100
parents 060f02cd4591
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15
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1 using System;
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2 using System.Collections.Generic;
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3 using System.IO;
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4 using System.Text;
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5 using System.Text.RegularExpressions;
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6 using System.Xml;
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7 using System.Xml.Linq;
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8 using System.Xml.XPath;
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9
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10 namespace MetroWpf
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11 {
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12 /// <summary>
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13 /// Extension methods for the string data type
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14 /// </summary>
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15 public static class StringExtensions
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16 {
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17 #region · Extensions ·
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18
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19 #region · Common string extensions ·
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20
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21 /// <summary>
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22 /// Determines whether the specified string is null or empty.
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23 /// </summary>
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24 /// <param name="value">The string value to check.</param>
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25 public static bool IsEmpty(this string value)
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26 {
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27 return ((value == null) || (value.Length == 0));
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28 }
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29
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30 /// <summary>
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31 /// Determines whether the specified string is not null or empty.
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32 /// </summary>
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33 /// <param name="value">The string value to check.</param>
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34 public static bool IsNotEmpty(this string value)
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35 {
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36 return (value.IsEmpty() == false);
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37 }
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38
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39 /// <summary>
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40 /// Checks whether the string is empty and returns a default value in case.
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41 /// </summary>
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42 /// <param name="value">The string to check.</param>
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43 /// <param name="defaultValue">The default value.</param>
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44 /// <returns>Either the string or the default value.</returns>
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45 public static string IfEmpty(this string value, string defaultValue)
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46 {
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47 return (value.IsNotEmpty() ? value : defaultValue);
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48 }
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49
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50 /// <summary>
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51 /// Formats the value with the parameters using string.Format.
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52 /// </summary>
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53 /// <param name="value">The input string.</param>
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54 /// <param name="parameters">The parameters.</param>
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55 /// <returns></returns>
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56 public static string FormatWith(this string value, params object[] parameters)
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57 {
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58 return string.Format(value, parameters);
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59 }
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60
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61 /// <summary>
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62 /// Trims the text to a provided maximum length.
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63 /// </summary>
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64 /// <param name="value">The input string.</param>
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65 /// <param name="maxLength">Maximum length.</param>
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66 /// <returns></returns>
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67 /// <remarks>Proposed by Rene Schulte</remarks>
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68 public static string TrimToMaxLength(this string value, int maxLength)
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69 {
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70 return (value == null || value.Length <= maxLength ? value : value.Substring(0, maxLength));
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71 }
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72
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73 /// <summary>
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74 /// Trims the text to a provided maximum length and adds a suffix if required.
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75 /// </summary>
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76 /// <param name="value">The input string.</param>
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77 /// <param name="maxLength">Maximum length.</param>
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78 /// <param name="suffix">The suffix.</param>
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79 /// <returns></returns>
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80 /// <remarks>Proposed by Rene Schulte</remarks>
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81 public static string TrimToMaxLength(this string value, int maxLength, string suffix)
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82 {
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83 return (value == null || value.Length <= maxLength ? value : string.Concat(value.Substring(0, maxLength), suffix));
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84 }
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85
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86 /// <summary>
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87 /// Determines whether the comparison value strig is contained within the input value string
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88 /// </summary>
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89 /// <param name="inputValue">The input value.</param>
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90 /// <param name="comparisonValue">The comparison value.</param>
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91 /// <param name="comparisonType">Type of the comparison to allow case sensitive or insensitive comparison.</param>
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92 /// <returns>
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93 /// <c>true</c> if input value contains the specified value, otherwise, <c>false</c>.
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94 /// </returns>
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95 public static bool Contains(this string inputValue, string comparisonValue, StringComparison comparisonType)
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96 {
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97 return (inputValue.IndexOf(comparisonValue, comparisonType) != -1);
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98 }
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99
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100 /// <summary>
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101 /// Loads the string into a LINQ to XML XDocument
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102 /// </summary>
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103 /// <param name="xml">The XML string.</param>
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104 /// <returns>The XML document object model (XDocument)</returns>
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105 public static XDocument ToXDocument(this string xml)
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106 {
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107 return XDocument.Parse(xml);
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108 }
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109
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110 /// <summary>
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111 /// Loads the string into a XML DOM object (XmlDocument)
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112 /// </summary>
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113 /// <param name="xml">The XML string.</param>
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114 /// <returns>The XML document object model (XmlDocument)</returns>
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115 public static XmlDocument ToXmlDOM(this string xml)
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116 {
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117 var document = new XmlDocument();
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118
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119 document.LoadXml(xml);
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120
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121 return document;
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122 }
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123
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124 /// <summary>
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125 /// Loads the string into a XML XPath DOM (XPathDocument)
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126 /// </summary>
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127 /// <param name="xml">The XML string.</param>
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128 /// <returns>The XML XPath document object model (XPathNavigator)</returns>
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129 public static XPathNavigator ToXPath(this string xml)
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130 {
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131 var document = new XPathDocument(new StringReader(xml));
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132
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133 return document.CreateNavigator();
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134 }
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135
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136 /// <summary>
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137 /// Reverses / mirrors a string.
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138 /// </summary>
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139 /// <param name="value">The string to be reversed.</param>
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140 /// <returns>The reversed string</returns>
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141 public static string Reverse(this string value)
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142 {
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143 if (value.IsEmpty() || (value.Length == 1))
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144 {
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145 return value;
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146 }
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147
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148 var chars = value.ToCharArray();
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149
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150 Array.Reverse(chars);
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151
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152 return new string(chars);
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153 }
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154
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155 /// <summary>
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156 /// Ensures that a string starts with a given prefix.
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157 /// </summary>
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158 /// <param name="value">The string value to check.</param>
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159 /// <param name="prefix">The prefix value to check for.</param>
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160 /// <returns>The string value including the prefix</returns>
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161 /// <example>
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162 /// <code>
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163 /// var extension = "txt";
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164 /// var fileName = string.Concat(file.Name, extension.EnsureStartsWith("."));
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165 /// </code>
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166 /// </example>
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167 public static string EnsureStartsWith(this string value, string prefix)
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168 {
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169 if (value.StartsWith(prefix))
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170 {
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171 return value;
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172 }
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173
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174 return string.Concat(prefix, value);
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175 }
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176
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177 /// <summary>
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178 /// Ensures that a string ends with a given suffix.
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179 /// </summary>
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180 /// <param name="value">The string value to check.</param>
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181 /// <param name="suffix">The suffix value to check for.</param>
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182 /// <returns>The string value including the suffix</returns>
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183 /// <example>
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184 /// <code>
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185 /// var url = "http://www.pgk.de";
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186 /// url = url.EnsureEndsWith("/"));
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187 /// </code>
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188 /// </example>
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189 public static string EnsureEndsWith(this string value, string suffix)
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190 {
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191 if (value.EndsWith(suffix))
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192 {
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193 return value;
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194 }
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195
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196 return string.Concat(value, suffix);
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197 }
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198
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199 #endregion
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200
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201 #region · Regex based extension methods ·
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202
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203 /// <summary>
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204 /// Uses regular expressions to determine if the string matches to a given regex pattern.
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205 /// </summary>
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206 /// <param name="value">The input string.</param>
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207 /// <param name="regexPattern">The regular expression pattern.</param>
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208 /// <returns>
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209 /// <c>true</c> if the value is matching to the specified pattern; otherwise, <c>false</c>.
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210 /// </returns>
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211 /// <example>
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212 /// <code>
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213 /// var s = "12345";
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214 /// var isMatching = s.IsMatchingTo(@"^\d+$");
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215 /// </code>
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216 /// </example>
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217 public static bool IsMatchingTo(this string value, string regexPattern)
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218 {
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219 return IsMatchingTo(value, regexPattern, RegexOptions.None);
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220 }
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221
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222 /// <summary>
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223 /// Uses regular expressions to determine if the string matches to a given regex pattern.
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224 /// </summary>
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225 /// <param name="value">The input string.</param>
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226 /// <param name="regexPattern">The regular expression pattern.</param>
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227 /// <param name="options">The regular expression options.</param>
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228 /// <returns>
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229 /// <c>true</c> if the value is matching to the specified pattern; otherwise, <c>false</c>.
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230 /// </returns>
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231 /// <example>
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232 /// <code>
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233 /// var s = "12345";
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234 /// var isMatching = s.IsMatchingTo(@"^\d+$");
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235 /// </code>
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236 /// </example>
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237 public static bool IsMatchingTo(this string value, string regexPattern, RegexOptions options)
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238 {
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239 return Regex.IsMatch(value, regexPattern, options);
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240 }
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241
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242 /// <summary>
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243 /// Uses regular expressions to replace parts of a string.
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244 /// </summary>
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245 /// <param name="value">The input string.</param>
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246 /// <param name="regexPattern">The regular expression pattern.</param>
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247 /// <param name="replaceValue">The replacement value.</param>
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248 /// <returns>The newly created string</returns>
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249 /// <example>
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250 /// <code>
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251 /// var s = "12345";
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252 /// var replaced = s.ReplaceWith(@"\d", m => string.Concat(" -", m.Value, "- "));
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253 /// </code>
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254 /// </example>
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255 public static string ReplaceWith(this string value, string regexPattern, string replaceValue)
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256 {
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257 return ReplaceWith(value, regexPattern, replaceValue, RegexOptions.None);
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258 }
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259
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260 /// <summary>
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261 /// Uses regular expressions to replace parts of a string.
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262 /// </summary>
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263 /// <param name="value">The input string.</param>
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264 /// <param name="regexPattern">The regular expression pattern.</param>
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265 /// <param name="replaceValue">The replacement value.</param>
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266 /// <param name="options">The regular expression options.</param>
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267 /// <returns>The newly created string</returns>
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268 /// <example>
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269 /// <code>
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270 /// var s = "12345";
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271 /// var replaced = s.ReplaceWith(@"\d", m => string.Concat(" -", m.Value, "- "));
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272 /// </code>
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273 /// </example>
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274 public static string ReplaceWith(this string value, string regexPattern, string replaceValue, RegexOptions options)
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275 {
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276 return Regex.Replace(value, regexPattern, replaceValue, options);
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277 }
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278
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279 /// <summary>
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280 /// Uses regular expressions to replace parts of a string.
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281 /// </summary>
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282 /// <param name="value">The input string.</param>
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283 /// <param name="regexPattern">The regular expression pattern.</param>
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284 /// <param name="evaluator">The replacement method / lambda expression.</param>
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285 /// <returns>The newly created string</returns>
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286 /// <example>
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287 /// <code>
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288 /// var s = "12345";
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289 /// var replaced = s.ReplaceWith(@"\d", m => string.Concat(" -", m.Value, "- "));
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290 /// </code>
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291 /// </example>
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292 public static string ReplaceWith(this string value, string regexPattern, MatchEvaluator evaluator)
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293 {
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294 return ReplaceWith(value, regexPattern, RegexOptions.None, evaluator);
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295 }
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296
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297 /// <summary>
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298 /// Uses regular expressions to replace parts of a string.
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299 /// </summary>
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300 /// <param name="value">The input string.</param>
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301 /// <param name="regexPattern">The regular expression pattern.</param>
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302 /// <param name="options">The regular expression options.</param>
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303 /// <param name="evaluator">The replacement method / lambda expression.</param>
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304 /// <returns>The newly created string</returns>
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305 /// <example>
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306 /// <code>
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307 /// var s = "12345";
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308 /// var replaced = s.ReplaceWith(@"\d", m => string.Concat(" -", m.Value, "- "));
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309 /// </code>
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310 /// </example>
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311 public static string ReplaceWith(this string value, string regexPattern, RegexOptions options, MatchEvaluator evaluator)
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312 {
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313 return Regex.Replace(value, regexPattern, evaluator, options);
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314 }
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315
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316 /// <summary>
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317 /// Uses regular expressions to determine all matches of a given regex pattern.
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318 /// </summary>
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319 /// <param name="value">The input string.</param>
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320 /// <param name="regexPattern">The regular expression pattern.</param>
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321 /// <returns>A collection of all matches</returns>
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322 public static MatchCollection GetMatches(this string value, string regexPattern)
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323 {
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324 return GetMatches(value, regexPattern, RegexOptions.None);
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325 }
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326
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327 /// <summary>
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328 /// Uses regular expressions to determine all matches of a given regex pattern.
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329 /// </summary>
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330 /// <param name="value">The input string.</param>
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331 /// <param name="regexPattern">The regular expression pattern.</param>
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332 /// <param name="options">The regular expression options.</param>
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333 /// <returns>A collection of all matches</returns>
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334 public static MatchCollection GetMatches(this string value, string regexPattern, RegexOptions options)
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335 {
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336 return Regex.Matches(value, regexPattern, options);
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337 }
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338
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339 /// <summary>
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340 /// Uses regular expressions to determine all matches of a given regex pattern and returns them as string enumeration.
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341 /// </summary>
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342 /// <param name="value">The input string.</param>
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343 /// <param name="regexPattern">The regular expression pattern.</param>
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344 /// <returns>An enumeration of matching strings</returns>
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345 /// <example>
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346 /// <code>
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347 /// var s = "12345";
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348 /// foreach(var number in s.GetMatchingValues(@"\d")) {
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349 /// Console.WriteLine(number);
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350 /// }
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351 /// </code>
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352 /// </example>
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353 public static IEnumerable<string> GetMatchingValues(this string value, string regexPattern)
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354 {
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355 return GetMatchingValues(value, regexPattern, RegexOptions.None);
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356 }
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357
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358 /// <summary>
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359 /// Uses regular expressions to determine all matches of a given regex pattern and returns them as string enumeration.
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360 /// </summary>
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361 /// <param name="value">The input string.</param>
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362 /// <param name="regexPattern">The regular expression pattern.</param>
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363 /// <param name="options">The regular expression options.</param>
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364 /// <returns>An enumeration of matching strings</returns>
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365 /// <example>
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366 /// <code>
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367 /// var s = "12345";
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368 /// foreach(var number in s.GetMatchingValues(@"\d")) {
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369 /// Console.WriteLine(number);
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370 /// }
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371 /// </code>
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372 /// </example>
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373 public static IEnumerable<string> GetMatchingValues(this string value, string regexPattern, RegexOptions options)
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374 {
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375 foreach (Match match in GetMatches(value, regexPattern, options))
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376 {
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377 if (match.Success)
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378 {
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379 yield return match.Value;
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380 }
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381 }
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382 }
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383
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384 /// <summary>
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385 /// Uses regular expressions to split a string into parts.
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386 /// </summary>
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387 /// <param name="value">The input string.</param>
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388 /// <param name="regexPattern">The regular expression pattern.</param>
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389 /// <returns>The splitted string array</returns>
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390 public static string[] Split(this string value, string regexPattern)
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391 {
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392 return value.Split(regexPattern, RegexOptions.None);
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393 }
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394
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395 /// <summary>
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396 /// Uses regular expressions to split a string into parts.
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397 /// </summary>
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398 /// <param name="value">The input string.</param>
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399 /// <param name="regexPattern">The regular expression pattern.</param>
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400 /// <param name="options">The regular expression options.</param>
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401 /// <returns>The splitted string array</returns>
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402 public static string[] Split(this string value, string regexPattern, RegexOptions options)
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403 {
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404 return Regex.Split(value, regexPattern, options);
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405 }
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406
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407 /// <summary>
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408 /// Splits the given string into words and returns a string array.
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409 /// </summary>
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410 /// <param name="value">The input string.</param>
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411 /// <returns>The splitted string array</returns>
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412 public static string[] GetWords(this string value)
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413 {
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414 return value.Split(@"\W");
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415 }
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416
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417 /// <summary>
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418 /// Gets the nth "word" of a given string, where "words" are substrings separated by a given separator
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419 /// </summary>
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420 /// <param name="value">The string from which the word should be retrieved.</param>
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421 /// <param name="index">Index of the word (0-based).</param>
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422 /// <returns>
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423 /// The word at position n of the string.
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424 /// Trying to retrieve a word at a position lower than 0 or at a position where no word exists results in an exception.
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425 /// </returns>
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426 /// <remarks>Originally contributed by MMathews</remarks>
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427 public static string GetWordByIndex(this string value, int index)
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428 {
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429 var words = value.GetWords();
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430
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431 if ((index < 0) || (index > words.Length - 1))
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432 {
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433 throw new IndexOutOfRangeException("The word number is out of range.");
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434 }
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435
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436 return words[index];
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437 }
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438
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439 #endregion
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440
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441 #region · Bytes & Base64 ·
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442
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443 /// <summary>
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444 /// Converts the string to a byte-array using the default encoding
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445 /// </summary>
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446 /// <param name="value">The input string.</param>
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447 /// <returns>The created byte array</returns>
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448 public static byte[] ToBytes(this string value)
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449 {
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450 return value.ToBytes(null);
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451 }
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452
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453 /// <summary>
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454 /// Converts the string to a byte-array using the supplied encoding
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455 /// </summary>
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456 /// <param name="value">The input string.</param>
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457 /// <param name="encoding">The encoding to be used.</param>
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458 /// <returns>The created byte array</returns>
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459 /// <example><code>
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460 /// var value = "Hello World";
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461 /// var ansiBytes = value.ToBytes(Encoding.GetEncoding(1252)); // 1252 = ANSI
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462 /// var utf8Bytes = value.ToBytes(Encoding.UTF8);
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463 /// </code></example>
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464 public static byte[] ToBytes(this string value, Encoding encoding)
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465 {
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466 encoding = (encoding ?? Encoding.Default);
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467 return encoding.GetBytes(value);
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468 }
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469
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470 /// <summary>
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471 /// Encodes the input value to a Base64 string using the default encoding.
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472 /// </summary>
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473 /// <param name="value">The input value.</param>
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474 /// <returns>The Base 64 encoded string</returns>
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475 public static string EncodeBase64(this string value)
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476 {
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477 return value.EncodeBase64(null);
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478 }
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479
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480 /// <summary>
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481 /// Encodes the input value to a Base64 string using the supplied encoding.
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482 /// </summary>
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483 /// <param name="value">The input value.</param>
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484 /// <param name="encoding">The encoding.</param>
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485 /// <returns>The Base 64 encoded string</returns>
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486 public static string EncodeBase64(this string value, Encoding encoding)
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487 {
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488 encoding = (encoding ?? Encoding.UTF8);
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489
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490 var bytes = encoding.GetBytes(value);
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491
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492 return Convert.ToBase64String(bytes);
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493 }
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494
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495 /// <summary>
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496 /// Decodes a Base 64 encoded value to a string using the default encoding.
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497 /// </summary>
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498 /// <param name="encodedValue">The Base 64 encoded value.</param>
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499 /// <returns>The decoded string</returns>
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500 public static string DecodeBase64(this string encodedValue)
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501 {
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502 return encodedValue.DecodeBase64(null);
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503 }
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504
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505 /// <summary>
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506 /// Decodes a Base 64 encoded value to a string using the supplied encoding.
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507 /// </summary>
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508 /// <param name="encodedValue">The Base 64 encoded value.</param>
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509 /// <param name="encoding">The encoding.</param>
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510 /// <returns>The decoded string</returns>
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511 public static string DecodeBase64(this string encodedValue, Encoding encoding)
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512 {
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513 encoding = (encoding ?? Encoding.UTF8);
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514
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515 var bytes = Convert.FromBase64String(encodedValue);
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516
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517 return encoding.GetString(bytes);
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518 }
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519
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520 #endregion
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521
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522 #endregion
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523 }
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524 }