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    <p>Both of your regular expressions (for block and line comments) have bugs. If you want I can describe the bugs, but I felt it’s perhaps more productive if I write new ones, especially because I’m intending to write a single one that matches both.</p> <p>The thing is, every time you have <code>/*</code> and <code>//</code> and literal strings “interfering” with each other, it is always the one that starts first that takes precedence. That’s very convenient because that’s exactly how regular expressions work: find the first match first.</p> <p>So let’s define a regular expression that matches each of those four tokens:</p> <pre><code>var blockComments = @"/\*(.*?)\*/"; var lineComments = @"//(.*?)\r?\n"; var strings = @"""((\\[^\n]|[^""\n])*)"""; var verbatimStrings = @"@(""[^""]*"")+"; </code></pre> <p>To answer the question in the title (strip comments), we need to:</p> <ul> <li>Replace the block comments with nothing</li> <li>Replace the line comments with a newline (because the regex eats the newline)</li> <li>Keep the literal strings where they are.</li> </ul> <p><code>Regex.Replace</code> can do this easily using a MatchEvaluator function:</p> <pre><code>string noComments = Regex.Replace(input, blockComments + "|" + lineComments + "|" + strings + "|" + verbatimStrings, me =&gt; { if (me.Value.StartsWith("/*") || me.Value.StartsWith("//")) return me.Value.StartsWith("//") ? Environment.NewLine : ""; // Keep the literal strings return me.Value; }, RegexOptions.Singleline); </code></pre> <p>I ran this code on all the examples that Holystream provided and various other cases that I could think of, and it works like a charm. If you can provide an example where it fails, I am happy to adjust the code for you.</p>
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    1. COI do not need to extract the comments, just strip them out of my source script. I tried your code, and it worked well. Ideally, I'd like to remove any line completely, if the line only contained comments. e.g. no blank lines left where a comment was. However, this is not a requirement, just a formatting preference. Thanks.
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    2. CO@Welton: Well, you could just run `Regex.Replace(@"^(\s*\r?\n){2,}", Environment.Newline, RegexOptions.Multiline)` on the result afterwards, but this will remove blank double-lines that *didn’t* have a comment in it too.
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    3. COI saw you tested this: http://csharp.pastebin.com/0aqBdFE5 but when you have something like this: string input = "1 + 2 //comments"; it fails it gives you as a result "1 + 2 \r\n" because of the Environment.Newline in the ternary operator
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