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From "Martin Thomas" <martin.tho...@scarceskills.com>
Subject Re: Stack Overflow Problem
Date Mon, 10 Feb 2003 16:56:10 GMT
Hi,

Actually, exactly the same occurs using:

String expression = "Baseline(.)*";

IMHO, I can't see why this should cause an infinite loop, blowing the stack.

Any more ideas?

Martin.



On 10 Feb 2003 at 11:43, Daniel F. Savarese wrote:

> 
> In message <3E47BFA4.16787.F0DE1CF@localhost>, "Martin Thomas" writes:
> >I'm using ORO 2.0.7 and I get a stack overflow exception with the following:
> ....
> >String expression = "(\\(|\\)|^| |,|\\.|;)Baseline(.)*(\\(|\\)| |,|\\.|;|$
> ....
> >Any help / advice would be appreciated.
> 
> Use character classes instead of grouped alternations.  Perl patterns are
> miniature programs.  Being NFAs, it is just as possible to write a Perl
> regex that backtracks too heavily or creates an infinite loop, busting
> the stack, as it is in a programming language.
> 
> daniel
> 
> 
> 
> 
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Regards,

Martin.

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