Re^4: Regex solution needed


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Re^4: Regex solution needed

by ikegami (Patriarch)

on Feb 23, 2007 at 20:13 UTC ( #601813=note: print w/replies, xml )

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in reply to Re^3: Regex solution needed
in thread Regex solution needed

The \s should probably be \s+, and

    (?! \s+ fan )
    (?! \s+ game )
    (?! \s+ score )
    (?! \s+ player )
[download]

is slower than

    (?! \s+ (?: fan | game | score | player ) )
[download]

This factors out the constant \s+, and it uses | which probably has a lower overhead than (?!...). Furthermore, alternations of constant strings can be highly optimized by re engine modifications demerphq added to 5.9. (I don't think those particular strings can be optimized, though.)

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