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Re^3: Regex, capturing variables vs. speed

by robin (Chaplain)
on Oct 30, 2005 at 20:31 UTC ( #504038=note: print w/replies, xml ) Need Help??

in reply to Re^2: Regex, capturing variables vs. speed
in thread Regex, capturing variables vs. speed

Even faster is to use a single match, but to be explicit about what you're looking for, i.e.
'Better' => sub { $line =~ /(chr\S*).*?urn:lsid:(\S*).*?panel:([^:]*)/i }
It's always better to write (\S*)\s than (.*?)\s, because you're making it clear to the matching engine exactly what you're looking for (non-space characters in this case).

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Re^4: Regex, capturing variables vs. speed
by albert (Monk) on Oct 30, 2005 at 21:06 UTC
    Thanks. Speed yet better as you say....
    Rate Sep Non Death_star Better Sep 158510/s -- -10% -23% -65% Non 175363/s 11% -- -15% -61% Death_star 206769/s 30% 18% -- -54% Better 449757/s 184% 156% 118% --

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[TCLion]: Good Morning Monks, I am parsing logs and some date time formats are inconsistent. I am trying to make output all same format. What is the best way to convert a month(word) to month(number)?
[Corion]: TCLion: I'm not aware of a better way than manually building the hash, as all strptime incarnations I know have nasty edge cases

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