From: Stefan Monnier <monnier@IRO.UMontreal.CA>
Subject: Re: Stack overflow in regexp matcher
Date: 16 Oct 2003 14:56:52 -0400 [thread overview]
Message-ID: <jwvekxduicp.fsf-monnier+emacs/devel@vor.iro.umontreal.ca> (raw)
In-Reply-To: <u3cdt5efc.fsf@gnu.org>
> what this might mean?
Although, strictly speaking, regular expressions can be matched using
a finite-state machine, Emacs's regexp-matcher uses a backtracking matcher
and if the backtracking stack is too large you get a stack overflow.
In your case "nnfolder.*?sent" might work better.
Stefan
PS: As for why not use a finite-state machine... well one of the reasons
is that it's extra work, another is that Emacs's regexps aren't pure
regular expressions (most obviously because of backrefs).
Supposedly the latest glibc regexp code uses an FSM, and hopefully
someone will hack on it at some point to make it useable for Emacs.
In the mean time, you'll have to be careful with regexps to try and
avoid excessive stack use.
next prev parent reply other threads:[~2003-10-16 18:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-16 16:35 Stack overflow in regexp matcher Sam Steingold
2003-10-16 18:56 ` Stefan Monnier [this message]
2003-10-17 6:13 ` Stephen J. Turnbull
2003-10-17 13:55 ` Stefan Monnier
2003-10-17 14:24 ` Andreas Schwab
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