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Re: How do I extract the data that comes after a certain word?

by ikegami (Pope)
on Jun 18, 2012 at 19:55 UTC ( #976886=note: print w/replies, xml ) Need Help??


in reply to How do I extract the data that comes after a certain word?

First, previous answers use `$1`, but I hate using global variables when it's not necessary. It's not necessary here.

Second, previous answers assume you don't want to capture newlines, but you didn't say anything of the kind.

Fix:

if (my ($match) = $s =~ /yesterday (.*?) after/s) { say $match; }

Finally, using the `?` greediness modifier can lead to surprises (especially if you use more than one in a single pattern). If given

yesterday foo yesterday bar after

the above regex will capture

foo yesterday bar

If you want

bar

use the following instead:

if (my ($match) = $s =~ /hello ((?:(?!yesterday).)*) yesterday/s) { say $match; }

(?:(?!STRING).) is to STRING as [^CHAR] is to CHAR.

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[1nickt]: marioroy Yes, I am using it with MCE, as is Discipulus I believe. I was trying to work out how to make a cpanfile that would be smart enough to know which deps to require.
[1nickt]: See this code. (I expected to simply eval loading threads as a check, but weirdness happened with Perlbrew so it's a grep of -V ...)
[choroba]: Config might be better than grepping -V
[Corion]: Also see Config::V, which is less of that hackery, or that hackery hidden in a module ;)
[1nickt]: The problem was with Perlbrew
[Corion]: Whoops - Config::Perl::V
[1nickt]: I found that when using Perlbrew as recommended, with cpanminus in the system perl lib, such tests were failing to detect the data about the perl that was the install destination.

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