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    <p>Here's a .Net flavored Regex for partly parsing .Net flavor patterns, which should get pretty close:</p> <pre><code>\A (?&gt; \\. # Capture an escaped character | # OR \[\^? # a character class (?:\\.|[^\]])* # which may also contain escaped characters \] | # OR \(\?(?# inline comment!)\# (?&lt;Comment&gt;[^)]*) \) | # OR \#(?&lt;Comment&gt;.*$) # a common comment! | # OR [^\[\\#] # capture any regular character - not # or [ )* \z </code></pre> <p>Luckily, in .Net each capturing group remembers all of its captures, and not just the last, so we can find all captures of the <code>Comment</code> group in a single parse. The regex pretty much parses regular expression - but hardly fully, it just parses enough to find comments.<br> Here's how you use the result:</p> <pre><code>Match parsed = Regex.Match(pattern, pattern, RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline); if (parsed.Success) { foreach (Capture capture in parsed.Groups["Comment"].Captures) { Console.WriteLine(capture.Value); } } </code></pre> <p>Working example: <a href="http://ideone.com/YP3yt" rel="nofollow">http://ideone.com/YP3yt</a></p> <p>One last word of caution - this regex assumes the whole pattern is in <code>IgnorePatternWhitespace</code> mode. When it isn't set, all <code>#</code> are matched literally. Keep in mind the flag might change multiple times in a single pattern. In <code>(?-x)#(?x)#comment</code>, for example, regardless of <code>IgnorePatternWhitespace</code>, the first <code>#</code> is matched literally, <code>(?x)</code> turns the <code>IgnorePatternWhitespace</code> flag back on, and the second <code>#</code> is ignored.</p> <p>If you want a robust solution you can use a regex-language parser.<br> You can probably adapt the .Net source code and extract a parser:</p> <ul> <li><a href="http://referencesource.microsoft.com/#System/regex/system/text/regularexpressions/RegexParser.cs" rel="nofollow">Reference Source - RegexParser.cs</a></li> <li><a href="https://github.com/dotnet/corefx/blob/master/src/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexParser.cs" rel="nofollow">GitHub - RegexParser.cs</a></li> </ul>
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    1. COI chose .Net based on the OP other tags. If this pattern looks a little off it's because it's missing nested negated character classes: `[a-z-[c-e]]`, but they can only come at the end of the parent class, to it can parse the excess `]`'s well.
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    2. CONice work, thank you very much.
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    3. CO@Valamas - no problem! let me know if I've missed any interesting edge cases. I *think* I got it mostly right.
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