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Re^2: regex bug in perl 5.8.7

by imp (Priest)
on May 25, 2007 at 23:44 UTC ( #617631=note: print w/replies, xml ) Need Help??

in reply to Re: regex bug in perl 5.8.7
in thread regex bug in perl 5.8.7

The pattern isn't meant to be meaningful. The regex I listed was already reduced to the simplest case I could find that still caused a segfault. The original form was much different.

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Re^3: regex bug in perl 5.8.7
by diotalevi (Canon) on May 26, 2007 at 00:12 UTC

    In the future, you might want to use the (?{...}) form instead since that has no implications for compiling and interpolating another regexp.

    ⠤⠤ ⠙⠊⠕⠞⠁⠇⠑⠧⠊

      The regex that originally triggered the segfault was an attempt at a joke that used a modified version of the regex I wrote in this node.

      The joke was that someone in an irc channel at work said "<3", and someone else asked what the opposite of "<3" was. My response was qr[(??{/^<3/?qr/\A\z/:qr//;})]

      Which is this when written in a legible manner:

      my $negative = qr[ (??{ /^<3/ ? qr/\A\z/ : qr//; }) ]x;
      Which segfaulted, but only when the text being searched started with '<3'. After a little exploration I found the minimal regex that still segfaulted, and posted about it.

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