From: "David A. Black" <dblack@...>
Date: 2009-11-28T16:27:00+09:00
Subject: Re: where is grep?

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.


David

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