From: kjana@...4lab.to (YANAGAWA Kazuhisa)
Date: 2002-01-07T11:44:16+09:00
Subject: [ruby-talk:30402] Re: Efficient "lexing" in Ruby (maybe an RCR?)

In message <87lmfb6j8h.fsf@squeaker.lickey.com>
matt+dated+1010799012.80728c@lickey.com writes:

> This is mainly because the Regexp#match matches on the whole string,
> so if you want to match starting at an arbitrary position, you must
> create a substring.  Parsing a large string this way can create a lot
> of intermediate copies of the same string, stressing memory use.

Then you can use String#index(regexp, offset).  Eg:

    s = "foobarbaz"
    p s.index(/ba/, 0) #=> 3
    p s.index(/ba/, 3) #=> 3
    p s.index(/ba/, 6) #=> 6


-- 
kjana@dm4lab.to                                January 7, 2002
Youth comes but once in a lifetime.