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From "Martin Thomas" <martin.tho...@scarceskills.com>
Subject Re: Stack Overflow Problem
Date Mon, 10 Feb 2003 19:44:42 GMT
Daniel,

Thanks for your help with this.

Martin.

On 10 Feb 2003 at 13:15, Daniel F. Savarese wrote:

> 
> In message <3E47EA64.9585.FB4E4ED@localhost>, "Martin Thomas" writes:
> >OK, I've attached a test case that demonstrates the problem.
> 
> Thanks.  Your original expression works just fine if you change (.)* to
> (.*), even with the alternations and saved groups.  However, alternations
> tend to be inefficient and should be replaced with character classes
> whenever possible.  Contrary to my original assumption, the problem appears
> to have had nothing to do with backtracking.  I don't think this is
> a case of "blame the regular expression" as I had initially concluded.
> There are situations where a Perl regex (at least a 5.003 regex) can
> match the empty string an infinite  number of times.  That shouldn't
> happen with (.)*, but neither should there be a problem with too many
> saved groups being pushed onto the stack since there is only one.
> I'm going to file this away as a test case and look into it later.
> 
> daniel
> 
> 
> 
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