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All the Perl that's Practical to Extract and Report

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  • as long as you're using an 8-bit character set. Unicode kinda makes this sub-optimal :)
    • It should do just as well on UTF8, no? Except for its probable confusion on string length vs. number of bytes..
      • Nope. UTF-8 is particularly bad. In addition to potentially having combining characters in the match, which is a Unicode issue, you can run into lots of cases where the second (and third, and fourth, and fifth...) byte of two multibyte characters are identical but the characters aren't the same because the first byte isn't.

        This technique only works on fixed-width characters in sets with no combining characters (In which case it works really well) or in cases where you can ensure that you're only using the subset of characters that don't allow combining characters.