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From: gareth.rees@pobox.com (Gareth Rees)
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Subject: Re: how would you debug complex regexp searches??
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Mayer wrote:
> How would one go about debugging complicated regular expressions? Is
> there some way of single-stepping through a regexp matching, so that I
> can see all the characters that were matched?

I find `isearch-forward-regexp' (bound to `C-M-s' by default) very
useful when debugging regexps: you can see interactively what each bit
of the regexp matches.

-- 
Gareth Rees