From: Brian Candler <b.candler@...>
Date: 2011-04-07T17:39:17+09:00
Subject: Re: Match a pattern multiple times, returning matches, captures and offset?

7stud -- wrote in post #991338:
> You can also get relative beginning offsets like this:
>
> str = "_foo_ _bar_"
>
> str.scan(/_(\w+)_/) do |curr_match|
>   md = Regexp.last_match
>   whole_match = md[0]
>   captures = md.captures
>
>   captures.each do |capture|
>     p [whole_match, capture, whole_match.index(capture)]
>   end
>
> end

Using 'index' doesn't work if you have multiple captures which have the 
same pattern, or one is a substring of the other.

Use captures.begin and captures.end instead.

>> md = /(...)(...)/.match "foofoo"
=> #<MatchData "foofoo" 1:"foo" 2:"foo">
>> md.captures
=> ["foo", "foo"]
>> md.begin(1)
=> 0
>> md.begin(2)
=> 3

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