From: Gavin Sinclair <gsinclair@...>
Date: 2003-11-15T11:37:05+09:00
Subject: Re: substring: to the end of the string

On Saturday, November 15, 2003, 12:24:42 PM, Rodrigo wrote:

> class String
>   def substring
>      /(^...)(.*)\z/ =~ self
>      return $2
>   end
> end

> "123456".substring 
>   = >"456"

> Now......

> I am just wondering how can I build dinamically the Regexp
> I mean ...

> "123456".substring(5)
>  = > "6"

> "123456".substring(4)
= >> "56"

> ideas ?

Regexen are overkill here.

  class String
    def substring(m, n=-1)
      self[m..n]
    end
  end


Gavin