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copied!<p>Your first problem is that you need three (possibly four) cases in your alternation, not two.</p> <ul> <li><code>/\breverse!(?:\s|$)/</code> reverse! by itself</li> <li><code>/\bpush\b/</code> push by itself</li> <li><code>/\breverse!push\b/</code> together</li> <li><code>/\bpushreverse!(?:\s|$)/</code> this is the possible case</li> </ul> <p>Your second problem is that a <code>\b</code> won't match after a <code>"!"</code> because it is not a <code>\w</code>. Here is what <a href="http://perldoc.perl.org/perlre.html" rel="nofollow noreferrer">Perl 5 has to say about <code>\b</code></a>, you may want to consult your docs to see if they agree:</p> <blockquote> <p>A word boundary ("\b") is a spot between two characters that has a "\w" on one side of it and a "\W" on the other side of it (in either order), counting the imaginary characters off the beginning and end of the string as matching a "\W". (Within character classes "\b" represents backspace rather than a word boundary, just as it normally does in any double-quoted string.)</p> </blockquote> <p>So, the regex that you need is something like</p> <pre><code>/ \b ( reverse!push | reverse! | push ) (?: \s | \b | $ )+ /gx; </code></pre> <p>I left out the <code>/s</code> because there are not periods in this regex, so treat as single line makes no sense. If <code>/s</code> doesn't mean treat as a single line in your engine you should probably add it back. Also, you should read up on how your engine handles alternation. I know in Perl 5 to get the right behaviour you must arrange the items this way (otherwise reverse! would always win over reverse!push).</p>

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