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PORegex to strip line comments from C#
 

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    <p>I'm working on a routine to strip block <em>or</em> line comments from some C# code. I have looked at the other examples on the site, but haven't found the <em>exact</em> answer that I'm looking for.</p> <p>I can match block comments (/* comment */) in their entirety using this regular expression with RegexOptions.Singleline:</p> <p><code>(/\*[\w\W]*\*/)</code></p> <p>And I can match line comments (// comment) in their entirety using this regular expression with RegexOptions.Multiline:</p> <p><code>(//((?!\*/).)*)(?!\*/)[^\r\n]</code></p> <p><em>Note: I'm using <code>[^\r\n]</code> instead of <code>$</code> because <code>$</code> is including <code>\r</code> in the match, too.</em></p> <p>However, this doesn't <em>quite</em> work the way I want it to.</p> <p>Here is my test code that I'm matching against:</p> <pre><code>// remove whole line comments bool broken = false; // remove partial line comments if (broken == true) { return "BROKEN"; } /* remove block comments else { return "FIXED"; } // do not remove nested comments */ bool working = !broken; return "NO COMMENT"; </code></pre> <p>The block expression matches </p> <pre><code>/* remove block comments else { return "FIXED"; } // do not remove nested comments */ </code></pre> <p>which is fine and good, but the line expression matches</p> <pre><code>// remove whole line comments // remove partial line comments </code></pre> <p><em>and</em></p> <pre><code>// do not remove nested comments </code></pre> <p>Also, if I do not have the */ positive lookahead in the line expression twice, it matches</p> <pre><code>// do not remove nested comments * </code></pre> <p>which I <em>really</em> don't want.</p> <p>What I want is an expression that will match characters, starting with <code>//</code>, to the end of line, but does <em>not</em> contain <code>*/</code> between the <code>//</code> and end of line.</p> <p>Also, just to satisfy my curiosity, can anyone explain why I need the lookahead twice? <code>(//((?!\*/).)*)[^\r\n]</code> and <code>(//(.)*)(?!\*/)[^\r\n]</code> will both include the *, but <code>(//((?!\*/).)*)(?!\*/)[^\r\n]</code> and <code>(//((?!\*/).)*(?!\*/))[^\r\n]</code> won't.</p>
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    1. COHave you also considered the case where `string foo = "http://stackoverflow.com;"`
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    2. COYour `/* ... */` pattern overmatches due to greediness, e.g. consider `/* comment1 */ not-a-comment! /* comment2 */`.
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    3. COYou might consider using a parser for C# instead: http://stackoverflow.com/questions/81406/parser-for-c
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