Re: Benchmarking "Are all these characters in this sentence?"

Just for completeness, try this one, too:

  martin => sub {
      # args: sentence, wantedchars
      '' eq $_[1] ||
      '' ne $_[0] &&
      $_[1] =~ /^[\Q$_[0]\E]*\z/;
  },
[download]

Putting the whole sentence into a character class will kind of suck with veeery long sentences but medium-sized cases should benefit from the one-pass approach.

Update: fixed the order of subroutine parameters

Comment on Re: Benchmarking "Are all these characters in this sentence?" Download Code

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Re^2: Benchmarking "Are all these characters in this sentence?" by RMGir (Prior) on Sep 05, 2008 at 17:22 UTC
You're checking whether only the wantedchars are used. That wouldn't work. The question isn't whether the sentence consists ONLY of characters in the wantedchars, just whether or not ALL the wantedchars are present. Mike	[reply]
Re^3: Benchmarking "Are all these characters in this sentence?" by martin (Friar) on Sep 08, 2008 at 09:43 UTC
You're checking whether only the wantedchars are used. Not quite. It's supposed to be the other way round. The idea is to check whether `$wantedchars` only contains characters from `$sentence`.	[reply]