From: Mark Wotton <mrak@cs.usyd.edu.au>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Searching large lists
Date: Fri, 9 Nov 2001 01:14:36 +1100 (EST) [thread overview]
Message-ID: <Pine.LNX.4.21.0111090111520.9753-100000@hons.cs.usyd.edu.au> (raw)
In-Reply-To: <20011108140657.75752.qmail@web12305.mail.yahoo.com>
On Thu, 8 Nov 2001, Andrew Lawson wrote:
> Hi all
> 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?
>
> thanks
>
> Andrew
This would probably require rewriting whatever you're using to do the
regexes, but if you use a trie to store all the strings, you could
maintain a list of nodes which matched at each stage of the regex. This
should be a fair bit faster...
mrak
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next prev parent reply other threads:[~2001-11-08 14:14 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 [this message]
2001-11-08 15:24 ` Jerome Vouillon
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