From: Wayne Magor <wemagor@...>
Date: 2007-11-21T23:11:17+09:00
Subject: Re: Regexp for parsing?

Noah Easterly wrote:
> On Nov 18, 8:50 pm, Wayne Magor <Wayne.Ma...@gmail.com> wrote:
>> I understand regular expressions, but can someone please explain this:
>>
>> re = %r/((?<pg>\((?:\\[()]|[^()]|\g<pg>)*\)))/
snip
> (?: ... | ... | ... )*
> -- non-capturing group of 3 alternatives, repeated 0 or more times
> \\[()]
> -- escaped literal parens
> [^()]
> -- anything except parens
> \g<pg>
> -- match the pg-named pattern here

Ok, so there are 3 alternatives in the non-capturing group:

1.  An open or close parenthesis
2.  Any character except a paren
3.  A pattern that starts with an open paren

Am I the only one that finds this strange?

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