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annotate third_party/sqlite3/Replace.cs @ 174:1ba8c1df082c hg-web

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Remove playground stuff.
author MrJuneJune <me@mrjunejune.com>
date Mon, 19 Jan 2026 18:59:23 -0800
parents 589bab390fb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 ** 2016 February 26
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3 **
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4 ** The author disclaims copyright to this source code. In place of
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5 ** a legal notice, here is a blessing:
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6 **
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7 ** May you do good and not evil.
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8 ** May you find forgiveness for yourself and forgive others.
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9 ** May you share freely, never taking more than you give.
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10 **
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11 *************************************************************************
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12 ** This file contains C# code to perform regular expression replacements
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13 ** using the standard input and output channels.
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14 */
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15
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16 using System;
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17 using System.Diagnostics;
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18 using System.IO;
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19 using System.Reflection;
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20 using System.Runtime.InteropServices;
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21 using System.Text.RegularExpressions;
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22
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23 ///////////////////////////////////////////////////////////////////////////////
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24
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25 #region Assembly Metadata
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26 [assembly: AssemblyTitle("Replace Tool")]
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27 [assembly: AssemblyDescription("Replace text using standard input/output.")]
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28 [assembly: AssemblyCompany("SQLite Development Team")]
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29 [assembly: AssemblyProduct("SQLite")]
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30 [assembly: AssemblyCopyright("Public Domain")]
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31 [assembly: ComVisible(false)]
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32 [assembly: Guid("95a0513f-8863-48cd-a76f-cb80868cb578")]
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33 [assembly: AssemblyVersion("1.0.*")]
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34
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35 #if DEBUG
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36 [assembly: AssemblyConfiguration("Debug")]
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37 #else
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38 [assembly: AssemblyConfiguration("Release")]
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39 #endif
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40 #endregion
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41
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42 ///////////////////////////////////////////////////////////////////////////////
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43
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44 namespace Replace
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45 {
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46 /// <summary>
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47 /// This enumeration is used to represent all the possible exit codes from
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48 /// this tool.
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49 /// </summary>
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50 internal enum ExitCode
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51 {
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52 /// <summary>
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53 /// The file download was a success.
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54 /// </summary>
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55 Success = 0,
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56
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57 /// <summary>
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58 /// The command line arguments are missing (i.e. null). Generally,
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59 /// this should not happen.
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60 /// </summary>
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61 MissingArgs = 1,
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62
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63 /// <summary>
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64 /// The wrong number of command line arguments was supplied.
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65 /// </summary>
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66 WrongNumArgs = 2,
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67
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68 /// <summary>
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69 /// The "matchingOnly" flag could not be converted to a value of the
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70 /// <see cref="Boolean"/> type.
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71 /// </summary>
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72 BadMatchingOnlyFlag = 3,
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73
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74 /// <summary>
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75 /// An exception was caught in <see cref="Main" />. Generally, this
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76 /// should not happen.
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77 /// </summary>
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78 Exception = 4
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79 }
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80
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81 ///////////////////////////////////////////////////////////////////////////
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82
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83 internal static class Replace
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84 {
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85 #region Private Support Methods
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86 /// <summary>
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87 /// This method displays an error message to the console and/or
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88 /// displays the command line usage information for this tool.
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89 /// </summary>
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90 /// <param name="message">
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91 /// The error message to display, if any.
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92 /// </param>
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93 /// <param name="usage">
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94 /// Non-zero to display the command line usage information.
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95 /// </param>
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96 private static void Error(
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97 string message,
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98 bool usage
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99 )
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100 {
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101 if (message != null)
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102 Console.WriteLine(message);
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103
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104 string fileName = Path.GetFileName(
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105 Process.GetCurrentProcess().MainModule.FileName);
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106
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107 Console.WriteLine(String.Format(
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108 "usage: {0} <regExPattern> <regExSubSpec> <matchingOnly>",
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109 fileName));
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110 }
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111 #endregion
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112
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113 ///////////////////////////////////////////////////////////////////////
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114
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115 #region Program Entry Point
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116 /// <summary>
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117 /// This is the entry-point for this tool. It handles processing the
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118 /// command line arguments, reading from the standard input channel,
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119 /// replacing any matching lines of text, and writing to the standard
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120 /// output channel.
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121 /// </summary>
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122 /// <param name="args">
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123 /// The command line arguments.
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124 /// </param>
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125 /// <returns>
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126 /// Zero upon success; non-zero on failure. This will be one of the
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127 /// values from the <see cref="ExitCode" /> enumeration.
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128 /// </returns>
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129 private static int Main(
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130 string[] args
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131 )
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132 {
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133 //
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134 // NOTE: Sanity check the command line arguments.
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135 //
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136 if (args == null)
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137 {
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138 Error(null, true);
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139 return (int)ExitCode.MissingArgs;
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140 }
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141
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142 if (args.Length != 3)
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143 {
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144 Error(null, true);
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145 return (int)ExitCode.WrongNumArgs;
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146 }
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147
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148 try
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149 {
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150 //
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151 // NOTE: Create a regular expression from the first command
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152 // line argument. Then, grab the replacement string,
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153 // which is the second argument.
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154 //
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155 Regex regEx = new Regex(args[0]);
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156 string replacement = args[1];
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157
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158 //
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159 // NOTE: Attempt to convert the third argument to a boolean.
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160 //
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161 bool matchingOnly;
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162
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163 if (!bool.TryParse(args[2], out matchingOnly))
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164 {
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165 Error(null, true);
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166 return (int)ExitCode.BadMatchingOnlyFlag;
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167 }
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168
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169 //
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170 // NOTE: Grab the standard input and output channels from the
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171 // console.
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172 //
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173 TextReader inputTextReader = Console.In;
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174 TextWriter outputTextWriter = Console.Out;
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175
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176 //
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177 // NOTE: Loop until end-of-file is hit on the standard input
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178 // stream.
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179 //
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180 while (true)
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181 {
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182 //
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183 // NOTE: Read a line from the standard input channel. If
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184 // null is returned here, there is no more input and
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185 // we are done.
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186 //
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187 string inputLine = inputTextReader.ReadLine();
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188
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189 if (inputLine == null)
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190 break;
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191
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192 //
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193 // NOTE: Perform regular expression replacements on this
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194 // line, if any. Then, write the modified line to
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195 // the standard output channel.
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196 //
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197 string outputLine = regEx.Replace(inputLine, replacement);
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198
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199 if (!matchingOnly || !String.Equals(
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200 inputLine, outputLine, StringComparison.Ordinal))
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201 {
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202 outputTextWriter.WriteLine(outputLine);
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203 }
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204 }
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205
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206 //
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207 // NOTE: At this point, everything has succeeded.
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208 //
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209 return (int)ExitCode.Success;
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210 }
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211 catch (Exception e)
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212 {
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213 //
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214 // NOTE: An exception was caught. Report it via the console
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215 // and return failure.
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216 //
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217 Error(e.ToString(), false);
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218 return (int)ExitCode.Exception;
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219 }
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220 }
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221 #endregion
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222 }
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223 }