From: Felix Windt <fwmailinglists@...>
Date: 2007-07-19T20:38:43+09:00
Subject: Re: identify and extract positions from a string - how to?

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> Thanks a lot, dont know how I missed that in the string chapter.
> 
> Anyhow, another thing came up:
> 
> while string[1..10] is pretty much what I was looking for - 
> is there any way that I can substitute the numbers (or the 
> whole content of the square brackets for that matter) with variables?
> 
> As it is now I have a file that contains coordinates and a 
> second file that contains the string that I want to extract from.
> 
> So ideally the script would read each line of the coordinate file
> 
> 45..78
> 90..120
> etc
> 
> and uses it in the extraction method
> 
> file.readlines each do |l|
>   puts string[l]
> end
> 
> Doesnt work tho -any suggestions on how to pipe each line of 
> the coordinate file to the string method? I know I know, 
> probably simple, but I am still learning ;)
> 
> Cheers,
> 
> Marc
> 
> --
> Posted via http://www.ruby-forum.com/.


irb(main):001:0> (a,b) = "3..5".split("..").map {|x| x.to_i}
=> [3, 5]
irb(main):002:0> "test_string"[a..b]
=> "t_s"
> 

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