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Date:      Fri, 29 Mar 2002 11:01:02 -0800
From:      Lars Eggert <larse@ISI.EDU>
To:        Ilia Chipitsine <ilia@cgu.chel.su>
Cc:        questions@FreeBSD.ORG, hackers@FreeBSD.ORG
Subject:   Re: perfomance and regular expressions
Message-ID:  <3CA4B9EE.6050001@isi.edu>
References:  <Pine.BSF.4.10.10203292117510.1096-100000@jane.poka.net>
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[-- Attachment #1 --]
Ilia Chipitsine wrote:
> I'm currently implementing a program which will run thousands and
> thousands times. It uses regular expressions.
> 
> something really simple, like
> 
> regex_t re;
> regcomp(&re,"^[0123456789abcdefghijklmnopqrstuvwxyz]{1,8}$",
>                                          REG_EXTENDED+REG_ICASE);
> return(!regexec(&re,name,0,0,0));
> 
> so, questions are:
> 
> 1) is it faster to "compile" regex once and load it from file every time
>    program starts ?
> 
> 2) how to store in a file data of type "regex_t" ??

Try using flex.

Lars
-- 
Lars Eggert <larse@isi.edu>               Information Sciences Institute
http://www.isi.edu/larse/              University of Southern California

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