From: Robert Klemme <shortcutter@...>
Date: 2009-11-29T01:10:06+09:00
Subject: Re: where is grep?

On 11/28/2009 08:27 AM, David A. Black wrote:
> Hi --
> 
> On Sat, 28 Nov 2009, Florian Gilcher wrote:
> 
>> Grep is not defined on Ruby 1.9-Strings.
>>
>> It was on Ruby 1.8-Strings, but only because they were belonging to the group 
>> of objects that mixed in Enumerable.
>>
>> There, grep behaves like this (line by line):
>>
>> x = "hello world baby girl"
>> x.grep(/hello/)
>> #=> ["hello world baby girl"]
>> x = "hello\nworld\nbaby\ngirl"
>> x.grep(/hello/)
>> #=> ["hello\n"]
>>
>> The same can be done in Ruby 1.9 by just splitting the String beforehand. 
>> Arrays are Enumerable and thus
>> still have grep:
>>
>> x = "hello\nworld\nbaby\ngirl"
>> x.split("\n").grep(/hello/)
>> #=> ["hello"]
>>
>> Note the absence of the line-break which might be intended or not :).
> 
> I would probably do this in 1.9:
> 
>    string.lines.grep(/pattern/)
> 
> where lines returns an enumerator.

Why not just string.scan(/pattern/) ?

Kind regards

	robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/