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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.


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


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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[choroba]: Well, merging two hashes recursivelly is not that hard either, but...
[Corion]: choroba: Yeah - I think I used (and extended) Hash::Merge for recursive merging
[Corion]: I still wonder if I should maybe publish Config::Collect, which (I think) is the dumb hash merger
[Corion]: It still needs some more ways of specifying defaults (in memory) and loading files (user-supplied loader(s)/ callbacks?), and the app-specific parts ripped out...

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