Συντάκτης: Philip Hazel Ημερομηνία: Προς: NN Υ/ο: Pcre-dev@exim.org Αντικείμενο: 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.
