Re^3: Comparing pattern

Did you read the documentation on study?

study attempts to make matches against a string more efficient, but incurs a one-time penalty for the time spent studying the string. It is most beneficial when you are doing many matches against a single string. You should benchmark to determine if you are getting any benefit from study. The first study in your code (line 10) is unnecessary, since you don't have a string in $_ to match against.

You keep saying "subroutine." Is this really in a sub? If so, are you reading in your patterns every time the sub is run? There's a major inefficiency. And once you solve that one, you can look at precompiling your expressions like I originally suggested.

print pack("A25",pack("V*",map{1919242272+$_}(34481450,-49737472,6228,0,-285028276,6979,-1380265972)))

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Re^4: Comparing pattern
by mrc (Sexton) on Sep 21, 2009 at 17:54 UTC

...
my $list_regex = join '|', @patterns;
my $regex_string = qr/$list_regex/is;
...
if (/($regex_string)/) {print "\n$arg1\n$1\n";}
[download]

study

pattern1
some text
pattern2

instead of this match:

pattern1.*pattern2
[download]

[reply]
[d/l]
[select]


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