From: "Wolfgang Nádasi-Donner" <ed.odanow@...>
Date: 2007-11-19T00:16:49+09:00
Subject: Re: Count substrings from a string

Robert Dober wrote:
> too bad scan does not have an overlap parameter

It has the possibility :-)


irb(main):001:0> "aaaaaa".scan(/(?=aa)/) do
irb(main):002:1*   puts "#{$~.pre_match}-#{$~[0]}-#{$~.post_match}"
irb(main):003:1> end
--aaaaaa
a--aaaaa
aa--aaaa
aaa--aaa
aaaa--aa
=> "aaaaaa"
irb(main):004:0> "aaaaaa".scan(/(?=aa)/).length
=> 5

With the look ahead features severals things can be done.

Wolfgang Nádasi-Donner
-- 
Posted via http://www.ruby-forum.com/.