"x" =~ / [\x{1234}] /x              for 0 .. 100_000;
"x" =~ /(?: \x{1234} | \x{1234} )/x for 0 .. 100_000;

"\x{4321}" =~ / \x{1234} /x         for 0 .. 100_000;

[download]

Curious, the bug doesn't bite if character is put in a class or dummy alternation. Most important, there's no bug if target string is utf8 itself. That's why, I think, it wasn't found sooner. Unicode in regexes most often means Unicode in texts.

In reply to Re: Memory leak in unicode substitution by vr
in thread Memory leak in unicode substitution by am12345

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