From: "Cameron, Gemma (UK)" <Gemma.Cameron@...>
Date: 2006-10-11T21:49:04+09:00
Subject: Re: scanning strings, backward?

Just to clarify I mean using regular expressions i.e.

if line =~ /$\W/i\Wdt/


Gem

-----Original Message-----
From: Cameron, Gemma (UK) 
Sent: 11 October 2006 13:10
To: ruby-talk ML
Subject: Re: scanning strings, backward?


Or use /$/ to look for what a line ends in?


Gem

-----Original Message-----
From: Vidar Hokstad [mailto:vidar@edgeio.com]
Sent: 11 October 2006 12:35
To: ruby-talk ML
Subject: Re: scanning strings, backward?

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Bil Kleb wrote:
> So, the tasks are roughly,
>
>   1) Goto line 1707 of the file
>   2) Search backward until line.match /\Wdt\W/i
>   3) Remove /dt/i
>
> I'm stuck on an elegant, i.e., Ruby, way to do the first two steps.  
> Please point me toward the glittering light.

For 1) Assuming the lines aren't fixed length: Read in the entire file
into an array (using IO#readlines), in which case you can skip straight
to the line you want, or counting line by line until you find the one
you want.

For 2) Any particular reason why you need to search backwards? My
suggestion would be to look at String#gsub - that will help you handle
both 2) and 3) in one go.

Vidar






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