On Fri, 2008-02-08 at 11:03 -0800, Paul Douglas Franklin of Yakima UGM wrote: > Can you point me to a good regex tutorial?
Have you tried `perldoc perlretut` ?
> The one I have found has
> given me a lot of good starting stuff, but it doesn't mention the ?:,
> and I'd like to learn more.
from perlretut...
Non-capturing groupings
We noted in Part 1 that groupings "()" had two distinct
functions: 1) group regexp elements together as a single unit, and 2)
extract, or capture, substrings that matched the regexp in the
grouping. Non-capturing groupings, denoted by "(?:regexp)", allow
the regexp to be treated as a single unit, but don't extract
substrings or set matching variables $1, etc. Both capturing and
non-capturing groupings are allowed to co-exist in the same
regexp. Because there is no extraction, non-capturing groupings are
faster than capturing groupings....
--
Daniel J McDonald, CCIE #2495, CISSP #78281, CNX
Austin Energy
http://www.austinenergy.com
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