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   jwz (jwz@mastodon.social)'s status on Tuesday, 07-Jan-2025 06:13:18 JST jwz

   Now I have two problems.

   Lazyweb, why doesn't this regexp match in Perl 5.32.1, 5.34.3 or 5.18.2 but does in PHP and JS: perl -le 'print 0 + ("ABCDE" =~ m/ABCF|BCDE|C(G)/);' Changing nearly any character, including the C before the G, or removing the...
   https://jwz.org/b/ykfv

   • Embed this notice
     Drew 🐘 (dvogel@mastodon.social)'s status on Tuesday, 07-Jan-2025 06:35:36 JST Drew 🐘

     in reply to

     @jwz I think the | and the () have inverse precedence ... maybe? IOW the opening paren around the G implies a paren group around everything before it.

   • Embed this notice
     jwz (jwz@mastodon.social)'s status on Tuesday, 07-Jan-2025 13:44:14 JST jwz

     in reply to

     Definitely did not have "finding an actual bug in Perl's regular expression matcher" on my 2025 bingo card, but it is certainly not going to be the weirdest thing I experience this year.

   • Embed this notice
     Greg Whitehead (grwster@mastodon.social)'s status on Tuesday, 07-Jan-2025 13:57:38 JST Greg Whitehead

     in reply to

     @jwz Hah, I got sucked into looking at that when I saw your post and decided that it must be a bug before pulling myself away. BTW, how are you connecting your blog posts to mastodon and getting replies as comments? I’d like to do something like that myself

   • Embed this notice
     John Wilson (crazybutable@mastodon.social)'s status on Tuesday, 07-Jan-2025 14:50:07 JST John Wilson

     in reply to

     @jwz I feel like if anyone would find the bug, cosmic forces would dictate that it would be you

   • Embed this notice
     jwz (jwz@mastodon.social)'s status on Tuesday, 07-Jan-2025 15:56:35 JST jwz

     in reply to

     • Joe Crawford
     • Greg Whitehead

     @artlung @grwster I am so glad to hear that someone else is using it because honestly I thought the total number of users would be me.

   • Embed this notice
     Joe Crawford (artlung@xoxo.zone)'s status on Tuesday, 07-Jan-2025 15:56:37 JST Joe Crawford

     in reply to

     • Greg Whitehead

     @grwster I'm a big fan of his code. I use it for my own blog. Presumes WordPress is where your comments are destined. See: https://www.jwz.org/hacks/mastodon-to-wp-comments.php

   • Embed this notice
     jwz (jwz@mastodon.social)'s status on Wednesday, 08-Jan-2025 04:17:50 JST jwz

     in reply to

     • Jeff

     @evilotto It was the obvious thing, "why isn't this long list of patterns matching the line they should definitely be matching", followed by a whole lot of reducing-the-test-case.

   • Embed this notice
     Jeff (evilotto@sfba.social)'s status on Wednesday, 08-Jan-2025 04:17:51 JST Jeff

     in reply to

     @jwz I'm curious what you were actually doing that didnt work for a non-obvious reason and led to a multi-hour exploration to create a minimal repro. If not ordinary custom scripts for web or sysadmin tasks, I'm guessing custom spamassassin rules or nagios plugins.