From: Albert Schlef <albertschlef@...>
Date: 2009-01-25T08:31:18+09:00
Subject: Re: how to find the position of each match within a string

> You can examine the $~ global MatchData object, in a couple of ways:
> 
> irb(main):003:0> "ello-hello".scan('e') do |match|
> irb(main):004:1*   p $~.pre_match.size
> irb(main):005:1> end
> 0
> 6

Interesting. Does that mean that String#scan() converts a String 
argument to RegExp?
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