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From: "Jake Donham" <jake.donham@skydeck.com>
To: caml-list@yquem.inria.fr
Subject: Re: ocamllex regexp problem
Date: Wed, 19 Mar 2008 09:39:41 -0700	[thread overview]
Message-ID: <c7e4e9f0803190939o2d916af2y11535fc2209c0a17@mail.gmail.com> (raw)
In-Reply-To: <c7e4e9f0803181903p49ab284h8ad74e8021be2ccd@mail.gmail.com>

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On Tue, Mar 18, 2008 at 7:03 PM, Jake Donham <jake.donham@skydeck.com>
wrote:

>   let ends_sq = [^']']* ']'
>   let ends_sq_sq = ends_sq ([^']'] ends_sq)* ']'+
>   let ends_sq_sq_ang = ends_sq_sq ([^'>'] ends_sq_sq)* '>'


My colleague Haoyang Wang points out that my regexp, when viewed
nondeterministically, matches "foo]]]>bar]]>", since ']'+ may match only
"]]", then [^'>'] matches the third "]". Changing it to [^'>'']'] repairs
it. So I guess the answer is that Micmatch on PCRE treats the regexp as
greedy, while ocamllex does not.

Thanks to those who replied,

Jake

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      parent reply	other threads:[~2008-03-19 16:39 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-19  2:03 Jake Donham
2008-03-19  9:00 ` [Caml-list] " Michael Wohlwend
2008-03-19 15:21 ` Martin Jambon
2008-03-19 16:39 ` Jake Donham [this message]

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