From: Dhruva Sagar <dhruva.sagar@...>
Date: 2011-04-27T15:32:46+09:00
Subject: Re: pattern matching and array methods

--001485f85f32a91a8d04a1e09b8f
Content-Type: text/plain; charset=UTF-8

Something like this should do it :

line.each {|l| puts l if l =~ /^(1:2)|(1:3)|(1:4)/}

On Wed, Apr 27, 2011 at 09:37, Mfer Dez <emphxl@yahoo.com> wrote:

> I have a text file that is structured like so:
>
> 1:1 abcdefg
> 1:2 abcdefg
> 1:3 abcdefg
> 1:4 abcdefg
> 1:5 abcdefg
>
> I would like to be able to print out a subset of the file ie: print the
> line beginning with 1:2 through the line beginning with 1:4
>
> So far, I've started with this;
>
> lines = File.readlines("file.txt")
>
> This puts each line of the text file into an array, so the lines[] array
> looks like this:
>
> line[0] is 1:1 abcdefg
> line[1] is 1:2 abcdefg
> line[2] is 1:3 abcdefg
> etc.
>
> If I want to print out the lines that start with 1:2 through 1:4, how
> should I proceed? Some of the text files won't be "aligned" in that
> line[0] won't always be 1:1. If a user would like to print the lines
> containing 3:9 - 3:31, how can I scan each line of the array and pattern
> match the boundaries (3:9 - 3:31 in this example)? What array methods
> are available to me.
>
> Thanks in advance for any information that could point me in the right
> direction.
>
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
Thanks & Regards,
Dhruva Sagar <http://dhruvasagar.net>
----------------------------
Technical Developer - Mentor,
Artha42 Innovations Pvt. Ltd. <http://www.artha42.com/>

Become an expert in Rails. Join our 3 day Rails workshop and learn Ruby,
Rails 3, Cucumber and Git.
http://www.railspundit.com

--001485f85f32a91a8d04a1e09b8f--