Re: [pcre-dev] Is DEFINE replaceable with smaller construct?

Author: Philip Hazel
Date:
To: NN
CC: Pcre-dev@exim.org
Subject: Re: [pcre-dev] Is DEFINE replaceable with smaller construct?

On Sat, 3 Jan 2009, NN wrote:

> Is there
> (?(DEFINE)X)
> equivalent to
> X{0}

Yes, if that is the complete regex. Also equivalent to an empty string.

No, if that is part of a larger regex that refers to any group contained
within the DEFINE. Please read the "pcrepattern" man page for a
description of what DEFINE is used for.

Philip

--
Philip Hazel

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