From: Simon Strandgaard <neoneye@...>
Date: 2004-05-15T17:23:41+09:00
Subject: Re: Regexp Error?

Robert Klemme wrote:
> "ts" <decoux@moulon.inra.fr> schrieb im Newsbeitrag
> news:200405141521.i4EFLOj03962@moulon.inra.fr...
> > >>>>> "R" == Robert Klemme <bob.news@gmx.net> writes:
> >
> > R> Definitely!  What strikes me odd is, that the engine must know start
> and
> > R> end of the match.  So it could relaize that end is at the end.
> >
> >  Well you can have another explanation in 'man 7 regex' (linux) (or
> another
> >  way to see it)
> >
> >     Match  lengths  are  measured in characters, not collating elements.
> A
> >     null string is considered longer than no match at  all.
> >
> >  It's in the case of null string vs no match
> 
> This reminds me of the mathematician that found an epsilon so small, that -
> if you divided it in halves - it was already negative. :-)

Epsilon transitions is a very interesting feature of regexp.. I like them.
However variable-width lookbehind with subcaptures and backreferences are
even more amazing (that would be suitable to a small research project).

-- 
Simon Strandgaard