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copied!<p>Kobi's answer partially works, but does not match lines of code that lack a comment at the end.</p> <p>It will also fail when it encounters string interpolation, e.g.:</p> <pre><code>str = "My name is #{first_name} #{last_name}" # first comment </code></pre> <p>...will be erroneously matched as: <code>str = "My name is #{first_name}</code></p> <p><strong>You need a more comprehensive regex.</strong> Here's one idea:</p> <pre><code>/^[\t ]*([^#"'\r\n]("(\\"|[^"])*"|'(\\'|[^'])*'|[^#\n\r])*)(#([^#\r\n]*))?/ </code></pre> <ul> <li><code>^[\t ]*</code> - Leading whitespace.</li> <li><code>([^#"'\r\n]("(\\"|[^"])*"|'(\\'|[^'])*'|[^#\n\r])*)</code> - Matches a line of code.<br>Breakdown: <ul> <li><code>[^#"'\r\n]</code> - the first character in a line of code, and...</li> <li><code>"(\\"|[^"])*"</code> - a double-quoted string, or...</li> <li><code>'(\\'|[^'])*'</code> - a single-quoted string, or...</li> <li><code>[^#\n\r]</code> - any other character outside a quoted string that is not a <code>#</code> or line ending.</li> </ul></li> <li><code>(#([^#\r\n]*))?</code> - Matches first comment at the end of a line of code, if any.</li> </ul> <p>Due to the more complex logic, this will capture 6 subpatterns for each match. Subpattern 1 is the code, subpattern 6 is the comment, and you can ignore the others.</p> <p>Given the following block of code:</p> <pre><code># Some ignored comment. 1 + 1 # Simple math (this comment would be collected) # ignored # ignored user = User.new user.name = "Ryan #{last_name}" # Setting an attribute # Another ignored comment </code></pre> <p>The above regex would produce the following (I excluded subpatterns 2, 3, 4, 5 for brevity):</p> <ol> <li><br>1. <code>1 + 1</code><br>6. <code>Simple math (this comment would be collected)</code></li> <li><br>1. <code>user = User.new</code><br>6.</li> <li><br>1. <code>user.name = "Ryan #{last_name}"</code><br>6. <code>Setting an attribute</code></li> </ol> <p>Demo: <a href="http://rubular.com/r/yKxEazjNPC" rel="nofollow">http://rubular.com/r/yKxEazjNPC</a></p>

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