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Re: Memory leak in unicode substitution

by vr (Curate)
on Aug 30, 2019 at 09:09 UTC ( [id://11105298]=note: print w/replies, xml ) Need Help??


in reply to Memory leak in unicode substitution

"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;

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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.

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Re^2: Memory leak in unicode substitution
by holli (Abbot) on Aug 30, 2019 at 17:06 UTC
    Good catch, can confirm. Surprisingly, simply adding use utf8; doesn't fix it though. Aren't all string literals to be Unicode when utf8 is in effect?


    holli

    You can lead your users to water, but alas, you cannot drown them.
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      No. use utf8; just means UTF-8 is used in the source code (both in string literals or identifiers). But even use feature qw( unicode_strings ); doesn't help here.

      map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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