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Message from discussion Word Loop (#149)
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Michal Suchanek  
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 More options Dec 10 2007, 7:50 pm
Newsgroups: comp.lang.ruby
From: Michal Suchanek <hramr...@centrum.cz>
Date: Mon, 10 Dec 2007 19:50:09 -0500
Local: Mon, Dec 10 2007 7:50 pm
Subject: Re: [QUIZ] Word Loop (#149)
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On 11/12/2007, Joe <qbpro...@gmail.com> wrote:

> /(.*?)(.)(.(?:..)+?)\2(.*)/i

> break it up:
> (.*?) looks for a non-greedy string of anything
> (.) any character
> (.(?:..)+?) non-greedy matching of an odd number of characters.  I'm
> not sure what the ?: adds to the regular expression.
> I got this: "(?: )      grouping without backreferences" from here:
> http://www.zenspider.com/Languages/Ruby/QuickRef.html#11

Yes, makes sense. This group would not be used in the match result.

> \2 matches the any character from before

I wonder if these are still regular epxpressions with those backreferences.

> (.*) a string of any length at the end

> i - at the end that means case insensitive.

> Joe

Thanks for the nice explanation.

Michal


 
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