From: Ross Bamford <rossrt@...>
Date: 2006-04-12T23:59:22+09:00
Subject: Re: Simple substitutions

On Wed, 2006-04-12 at 22:35 +0900, Peter Bailey wrote:
> Ross Bamford wrote:
> > If you do choose to read the whole thing in at once, one way to achieve
> > that might be:
> > 
> > 	pages = nil
> > 	File.read('test1.ps').scan(/\%\%Pages: ([0-9]{1,5})/) do
> > 	  pages = $1
> > 	  break
> > 	end
> > 
> > 	if pages
> > 	  File.open("psout.txt", "w") { |out| out << "Pages: #{pages}" }
> > 	end
> 
> 
> Aha. I didn't know about "scan." Just the word alone makes sense for 
> what I want. And, yes, I found it in the Big Book, on page 617.
> 
> What does the "break" do, Ross? Is it just telling RUBY to stop if it's 
> found what it was scanning for?

Yes - you can find a bit about it near the end of this page:

	http://www.rubycentral.com/book/tut_expressions.html

Looking at that again, though, I can't imagine why I didn't just write:

	if File.read('test1.ps') =~ /\%\%Pages: ([0-9]{1,5})/
	  pages = $1
	end

For just a single match.

-- 
Ross Bamford - rosco@roscopeco.REMOVE.co.uk