Frontier capture (WAS: Re: numeric captures (string.find))

[Fred Bayer <lua@...>]

Asko Kauppi wrote:

> But ability to capture a number explicitly (some new "%" entry) still 
> remains..  I'll think about it. :)
BTW, what's the matter with the "frontier pattern" %f? It's in the 
source but not
documented anywhere. It seems to match some kind of maximum prefix (?) 
according
to experiments, but not quite consistently. Is is just under 
construction currently?
I also didn'f find anything similar in other regex packages.

Ciao, Fred