Re: Regexes that use a string as basis for matching

you mean like

$s = "match";
$re = qr/$s/;
print "yup" if $something =~ $re;
[download]

or even simpler (but slower)

$s = "match";
print "yup" if $something =~ /$s/;
[download]

holli, /regexed monk/

Comment on Re: Regexes that use a string as basis for matching Select or Download Code

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Re^2: Regexes that use a string as basis for matching by ikegami (Patriarch) on Jun 15, 2008 at 05:35 UTC
The second snippet shouldn't be any slower. In both snippets, the regexp is compiled once. However, `my @regexps = ( 'pattern1', 'pattern2', ); for my $s (@strings) { for $re (@regexps) { something($s =~ /$re/); } }` [download] is slower than `my @regexps = ( qr/pattern1/, qr/pattern2/, ); for my $s (@strings) { for $re (@regexps) { something($s =~ /$re/); } }` [download] since the former compiles each regexp for each string, while the latter compiles each regexp once.	[reply] [d/l] [select]
Re^2: Regexes that use a string as basis for matching by Your Mother (Archbishop) on Jun 15, 2008 at 04:39 UTC
or even simpler (but slower) Why is it slower?	[reply]
Re^2: Regexes that use a string as basis for matching by gatito (Novice) on Jun 14, 2008 at 22:05 UTC
oooh thanks, that worked perfectly	[reply]