From: Robert Klemme <shortcutter@...>
Date: 2008-08-08T20:07:18+09:00
Subject: Re: Regex. How to return multiple lines

2008/8/8 Damjan Rems <d_rems@yahoo.com>:
>
> I have a text file containing some data. Rows are normaly delimited with
> newline char. I assume that file would be read in one chunk into memory.
>
> Is it possible with regex and how to return all lines containing some
> string.
>
> My first thought was to read file in array and process each line, but I
> guess if possible, operating on single string would be faster.

13:07:47 Temp$ ./l.rb
["aaa\n", "a\n", "aaa\n", "a\n"]
13:07:53 Temp$ cat x
aaa
b
c
dd
a
aaa
s
a
13:07:56 Temp$ cat l.rb
#!/bin/env ruby

c = File.read "x"

p c.grep /a+/

13:08:49 Temp$

There are of course other possible approaches and depending on what
you want to do they might be more efficient.

Kind regards

robert


-- 
use.inject do |as, often| as.you_can - without end