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Re: Re: How do I tighten this with map?

by mikeB (Friar)
on Oct 16, 2001 at 20:08 UTC ( #119169=note: print w/replies, xml ) Need Help??

in reply to Re: How do I tighten this with map?
in thread How do I tighten this with map?

Just curious why you replaced \w{3} with \w\w\w.
  • Comment on Re: Re: How do I tighten this with map?

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Re3: How do I tighten this with map?
by Hofmator (Curate) on Oct 17, 2001 at 16:13 UTC

    That's a little speed optimisation, with /\w{3}/ the regex engine sees the {} construct and has to start counting. If you write it out it's just three single characters in a row, so no counting => quicker.

    Of course, this could be optimised by the regex compiler but that wasn't the case at the time of writing of Mastering Regular Expressions. At least this is where I got this from. As japhy is more up to date on this I assume he has checked that this optimisation hasn't been done in the meantime.

    -- Hofmator

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