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From "David Wortham" <>
Subject Re: Regex Help with Mod Rewrite
Date Tue, 21 Aug 2007 16:34:47 GMT
   This is, in fact, not the correct place to ask such a question.  I would
direct you to an Apache administrators forum or perhaps try searching the
web or message boards/forums/groups for "mod_rewrite help". is always a good place to start for help with
specific issues with most flavors of RegEx.

Without knowing more of the specifics of your RewriteCond restrictions... I
would say you want something like "(rain,?|spain,?|plain,?)*"
Disclaimer: I did not test this Regex before responding and I know that you
can end up with a few false-positive conditions (like when your query string
params are not separated by commas)

I would venture a guess that Apache uses the PCRE flavor of regex, but I am
willing to bet you will find help which directly concerns mod_rewrite more
useful than general PCRE RegEx help.

Hope this helps.


On 8/21/07, Soumya Sanyal <> wrote:
> Hello,
> This might not be the most appropriate forum to field this question - but
> I'm having serious issues with the formulation of a regex for Mod Rewrite.
> I
> actually have a couple of questions to ask :
> 1> What is particular flavor of the regex engine being used by Mod Rewrite
> -
> there are ever so slight variations in the different regex engines, e.g.
> linux grep vs perl grep etc.
> 2> I'm having trouble formulating a good compact regex to represent the
> following problem :
> I want my RewriteCond to be conditioned on the %{QUERY_STRING} to contain
> only the powerset of a group of words e.g.
> Hence if my set is say {rain,spain,plain}
> The RewriteCond should say yes to the following :
> But not :
> Help please ?

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