Can't figure out why this regex doesn't match pattern

"mattslav" <matt.slavicekgmail.com> wrote:
>
>
>Ok, I replaced the square brackets with parens, and that
did the trick.
>I think that's all I need.
>
>I'm not sure what the difference is between a capturing
group and
>non-capturing group. Could you elaborate a little on
that?

capture groups/backreferences allow you to reference or
return only parts
of the expression -- which is where regex really becomes
useful in
find/replace routines.  Typically, stuff in parenthesis is
captured into a
backreference -- so in (find)(this)  find would be
backreference 1, and
this would be backreference 2.  To keep from having to count
a bunch of
backreferences to get just 1 or 2 bits of data, you can use
parenthesis and
have them NOT capture a backreference -- to do so just use
(?:find)(this)
-- in that case, find would be part of the overall match but
not a
backreference.  'this' would be backreference 1.

Jan Goyvaerts has written an excellent guide to regular
expressions that
covers this topic much better than I can--

http://
regular-expressions.info/brackets.html

-- 
Remember, no matter where you go, there you are. -Buckaroo
Banzai
Online Regex find/repalce utility: http://rereplace.com
Command-based online image editor: http://theprawn.com/imag
iine

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Great explanation! Thanks! And I'll be sure to check out
that reference.


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