From: Jerome Vouillon <jerome.vouillon@inria.fr>
To: andrew@absentis.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Searching large lists
Date: Thu, 8 Nov 2001 16:24:41 +0100 [thread overview]
Message-ID: <20011108162441.A16848@pauillac.inria.fr> (raw)
In-Reply-To: <20011108140657.75752.qmail@web12305.mail.yahoo.com>; from xandrew_lawsonx@yahoo.co.uk on Thu, Nov 08, 2001 at 06:06:57AM -0800
On Thu, Nov 08, 2001 at 06:06:57AM -0800, Andrew Lawson wrote:
> I have a list containing up to 100,000 strings
> between 10 and 200 characters in length. I want to
> produce a list of those that match a regular
> expression. It seems that the obvious way is to
> List.filter with a predicate returning true if the
> string matches, however in my case this can take up to
> 15 seconds. Has anyone got any ideas for speeding this
> up?
The Str library is really slow.
For Unison (http://www.cis.upenn.edu/~bcpierce/unison/), we wrote our
own regular expression library to get acceptable performances.
You should try PCRE (http://sourceforge.net/projects/pcre-ocaml/) or maybe RE
(http://sourceforge.net/projects/libre/).
If you compile to native code, the RE library should be the fastest in
your case (probably about 5 to 10 times faster than PCRE). It is
still under development though, so some features are missing.
-- Jerome
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prev parent reply other threads:[~2001-11-08 15:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-08 14:06 Andrew Lawson
2001-11-08 14:14 ` Mark Wotton
2001-11-08 15:24 ` Jerome Vouillon [this message]
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