From: timr <timrandg@...>
Date: 2009-08-29T00:05:05+09:00
Subject: Re: I need a string#all_indices method--is there such a thing?

On Aug 28, 5:02 am, Harry Kakueki <list.p...@gmail.com> wrote:
> > Does this do what you want?
>
> > class String
> >  def all_indices(reg)
> >    tmp,idx = [],[]
> >    (0...self.length).each{|x| tmp[x] = self[x..-1]}
> >    tmp.each_with_index{|y,i| idx << i if y =~ /\A#{reg}/}
> >    idx
> >  end
> > end
>
> > p "this is a test string for the ts in the worldt".all_indices(/th/)
> > #> [0, 26, 36]
>
> > Harry
>
> Sorry, it looks like I had an unnecessary line in there.
>
> class String
>   def all_indices(reg)
>     idx = []
>     (0...self.length).each{|x| idx << x if self[x..-1] =~ /\A#{reg}/}
>     idx
>   end
> end
>
> p "this is a test string for the ts in the worldt".all_indices(/th/)
> #> [0, 26, 36]
> p "banana".all_indices(/ana/) #> [1, 3]
>
> Harry
>
> --
> A Look into Japanese Ruby List in Englishhttp://www.kakueki.com/ruby/list.html

This works and the code is more concise than what I had, but it is a
brute force approach that test for matches from every possible
substring. That would be a bit slow.