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Re^9: Suggestion for regular expression speed improvement.

by demerphq (Chancellor)
on Jun 15, 2009 at 19:38 UTC ( #771774=note: print w/replies, xml ) Need Help??


in reply to Re^8: Suggestion for regular expression speed improvement.
in thread Suggestion for regular expression speed improvement.

Dont forget unpack. For fixed width fields its pretty much the fastest choice you have. And many logfiles are fixed width.

---
$world=~s/war/peace/g

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[Cosmic37]: now I have tried another blunder - can anyone explain why I am such a dunderhead?
[Cosmic37]: if ( $line =~ /$mydt/ ) { print $line; }
[Cosmic37]: I try to match successive date times stored in variable $mydt
[Cosmic37]: I guess it is searching for the string "$mydt"
[Corion]: Indeed cool, erix ;)
[Cosmic37]: rather than the value of $mydt which is a date time strong such as 2016-01-01 12:30:56
[Corion]: Cosmic37: No, but maybe $mydt doesn't contain what you think it does, or it contains characters that are special in a regular expression? Try if( $line =~ /\Q$mydt\E/) { ... for a literal match
[Cosmic37]: I mean string grrr
[Corion]: Maybe add an else branch in which you print what the values of $line and $mydt are?
[Cosmic37]: ah thank you I will try

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