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12364234
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2012-09-11T06:52:14.467
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2016-03-16T05:11:29.910
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2016-03-16T05:11:29.910
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My answer was similar to Nas Banov's answer but I wanted double quotes only if necessary. <h1>Cutting out extra unnecessary double quotes</h1> My code saves unnecessarily putting double quotes around it all the time which is important *when you are getting up close to the character limit for parameters. <pre><code>/// <summary> /// Encodes an argument for passing into a program /// </summary> /// <param name="original">The value that should be received by the program</param> /// <returns>The value which needs to be passed to the program for the original value /// to come through</returns> public static string EncodeParameterArgument(string original) { if( string.IsNullOrEmpty(original)) return original; string value = Regex.Replace(original, @"(\\*)" + "\"", @"$1\$0"); value = Regex.Replace(value, @"^(.*\s.*?)(\\*)$", "\"$1$2$2\""); return value; } // This is an EDIT // Note that this version does the same but handles new lines in the arugments public static string EncodeParameterArgumentMultiLine(string original) { if (string.IsNullOrEmpty(original)) return original; string value = Regex.Replace(original, @"(\\*)" + "\"", @"$1\$0"); value = Regex.Replace(value, @"^(.*\s.*?)(\\*)$", "\"$1$2$2\"", RegexOptions.Singleline); return value; } </code></pre> <h2>explanation</h2> To escape the backslashes and double quotes correctly you can just replace any instances of multiple backslashes followed by a single double quote with: <pre><code>string value = Regex.Replace(original, @"(\\*)" + "\"", @"\$1$0"); </code></pre> An extra twice the original backslashes + 1 and the original double quote. i.e., '\' + originalbackslashes + originalbackslashes + '"'. I used $1$0 since $0 has the original backslashes and the original double quote so it makes the replacement a nicer one to read. <pre><code>value = Regex.Replace(value, @"^(.*\s.*?)(\\*)$", "\"$1$2$2\""); </code></pre> This can only ever match an entire line that contains a whitespace. If it matches then it adds double quotes to the beginning and end. If there was originally backslashes on the end of the argument they will not have been quoted, now that there is a double quote on the end they need to be. So they are duplicated, which quotes them all, and prevents unintentionally quoting the final double quote It does a minimal matching for the first section so that the last .*? doesn't eat into matching the final backslashes <h1>Output</h1> So these inputs produce the following outputs hello hello \hello\12\3\ \hello\12\3\ hello world "hello world" \"hello\" \\"hello\\\" \"hello\ world "\\"hello\ world" \"hello\\\ world\ "\\"hello\\\ world\\" hello world\\ "hello world\\\\"
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1. POEscape command line arguments in c#
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1. USMatt Vukomanovic
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1. USMatt Vukomanovic
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