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copied!<ol> <li><p>Your first snippet doesn't «kill just about anything with the word " at " in it.». <code>at</code> has to be the second last word for it do anything.</p></li> <li><p>I think your two snippets (forward and reverse) are 100% equivalent (except that the second doesn't support a trailing newline, so it's probably never going to match).</p></li> <li><p>The pattern</p> <pre><code>/\s+ at \s+ \S+ (?:\s+ line \s+ \d+)?$/x </code></pre> <p>isn't going to match</p> <pre><code>$ perl -e'(eval "sub { die }")->()' Died at (eval 1) line 1. </code></pre></li> <li><p>The pattern</p> <pre><code>/\s+ at \s+ \S+ (?:\s+ line \s+ \d+)?$/x </code></pre> <p>isn't going to match</p> <pre><code>$ echo foo | perl -e'<STDIN>; die;' Died at -e line 1, <STDIN> line 1. </code></pre></li> <li><p>I don't think Perl will ever add a file name without adding a number.</p> <p>If the line number is optional, then it's inevitable that you'll match the last two words of "Dinner is at nine." unless you start employing heuristics.</p></li> </ol> <hr> <p>Looking at the source code, this is what <code>die</code> can append:</p> <pre><code>Adds: " at %s line %"IVdf Sometimes followed by: ", <%"SVf"> line %"IVdf or by: ", <%"SVf"> chunk %"IVdf Sometimes followed by: " during global destruction" Always followed by: ".\n" </code></pre> <p>That gives us:</p> <pre><code>s/ (?&BASE) (?&IO_CLAUSE)? (?&GLOBAL_DESTR)? \.?\n\z (?(DEFINE) (?<BASE> [ ] at [ ] (?&FILE_NAME) [ ] line [ ] [0-9]+ ) (?<IO_CLAUSE> , [ ] <(?&HANDLE_NAME)> [ ] (?:line|chunk) [ ] [0-9]+ ) (?<GLOBAL_DESTR> [ ]during[ ]global[ ]destruction ) # Heuristics: (?<FILE_NAME> \S+ | \(eval[ ][0-9]+\) ) (?<HANDLE_NAME> \w+ ) ) //x </code></pre> <p>That's as specific as it can be.</p> <p>(Note: Carp sometimes forgets the trailing "<code>.</code>", from what I hear.)</p> <p>(Note: Perl uses single spaces, so <code>[ ]</code> is more precise than <code>\s+</code>.)</p>

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