From: Axel Etzold <AEtzold@...>
Date: 2007-11-26T01:46:39+09:00
Subject: Re: [Q] specify start postion of Regexp matching


-------- Original-Nachricht --------
> Datum: Mon, 26 Nov 2007 00:20:25 +0900
> Von: makoto kuwata <kwa@kuwata-lab.com>
> An: ruby-talk@ruby-lang.org
> Betreff: [Q] specify start postion of Regexp matching

> Hi, all.
> 
> Is it possible to specify start position of Regexp matching?
> 
>     str = "foo bar baz"
>     m = /ba/.match(str)
>     p m.begin(0)             #=> 4
>     m = /ba/.match(str, 5)   # is it possible?
>     p m.begin(0)             #=> 8 (if possible)
> 
> If it is possible, some kind of parser or scanner can be
> implemented easily.
> # StringScanner is a litte too big, I think.
> 
> --
> makoto kuwata
> 

Dear Makoto,

what about :

class Regexp
	def match_index_offset(string,start_pos)
		temp=string[start_pos..-1]
		ref=self.match(temp)
		return temp.index(ref[0])+start_pos
	end
end

str = "foo bar baz"
m = /ba/.match_index_offset(str,5)
p m

Best regards,

Axel 

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