From: Robert Dober <robert.dober@...>
Date: 2007-06-04T19:19:04+09:00
Subject: Re: No way of looking for a regrexp match starting from a particular point in a string?

On 6/3/07, Kenneth McDonald <kenneth.m.mcdonald@sbcglobal.net> wrote:
> I'm probably just missing something obvious, but I haven't found a way
> to match a regular expression against only part of a string, in
> particular only past a certain point of a string, as a way of finding
> successive matches. Of course, one could do a match against a string,
> take the substring past that match and do a match against the substring,
> and so on, to find all of the matches for the string, but that could be
> very expensive for very large strings.
>
> I'm aware of the String.scan method, but that doesn't work for me
> because it doesn't return MatchData instances.
>
> What I want is just something like regexp.match(string, n),
Hmm apart of using #scan and #index with $~ as indicated, I do not
think that there is a performance penalty if you do

rg.match(string[n..-1])

Cheers
Robert


-- 
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw