Thursday, December 3, 2009

Re: Regular expression bug?

On Dec 3, 2:29 pm, Ben Fritz <fritzophre...@gmail.com> wrote:
> It does look like a bug, unless someone knows a strange feature of the
> \@<= zero-width match that prevents it from acting as expected.

Nevermind, not a bug, I found the "strange feature" myself.

Near the bottom of :help /\@<= you can see this:

The part of the pattern after "\@<=" and "\@<!" are checked for a
match first, thus things like "\1" don't work to reference \(\)
inside
the preceding atom.

In other words, since "producer" is matched BEFORE the stuff preceding
the \@<=, \1 contains nothing (a null string?) at this point in time
and therefore your match won't work.

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