Re: Regular expressions speedup

haberg@math.su.se (Hans Aberg)
7 Aug 2005 16:12:53 -0400

          From comp.compilers

Related articles
Regular expressions speedup cleos@nb.sympatico-dot-ca.remove (Cleo Saulnier) (2005-08-05)
Re: Regular expressions speedup haberg@math.su.se (2005-08-07)
Re: Regular expressions speedup cleos@nb.sympatico.ca (Cleo Saulnier) (2005-08-07)
Re: Regular expressions speedup haberg@math.su.se (2005-08-10)
Re: Regular expressions speedup bonzini@gnu.org (Paolo Bonzini) (2005-08-10)
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Re: Regular expressions speedup kszabo@bcml120x.ca.nortel.com (2005-08-10)
Re: Regular expressions speedup jburgy@gmail.com (2005-08-10)
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From: haberg@math.su.se (Hans Aberg)
Newsgroups: comp.compilers
Date: 7 Aug 2005 16:12:53 -0400
Organization: Mathematics
References: 05-08-023
Keywords: lex, comment

Cleo Saulnier <cleos@nb.sympatico-dot-ca.remove> wrote:


> I wrote my own Regular expressions parser CSRegEx for C++ (all OS) which
> is now on sourceforge as public domain. ... Are there any tips on how
> to speed up the matching process.


The book by Aho, Sethi & Ullman, "Compilers...", end of sec. 3.7, says
that best for both space and time is a "lazy transition evaluation"
technique.


--
    Hans Aberg
[I wonder if they feel differently about space tradeoffs now than they
did 30 years ago. At that point, programs had to fit into 16 bit address
spaces. -John]


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