From: Ruby Newbee <rubynewbee@...>
Date: 2009-11-28T12:49:36+09:00
Subject: Re: where is grep?

Thanks, that sounds be more reasonable, b/c I like to grep from an
array not a string (yes perl does this).

btw, why 0/0 got failed but 0.0/0.0 seems valid?

irb(main):144:0> v=0/0
ZeroDivisionError: divided by 0
        from (irb):144:in `/'
        from (irb):144
        from /usr/bin/irb:12:in `<main>'

irb(main):145:0> v=0.0/0.0
=> NaN




2009/11/28 Florian Gilcher <flo@andersground.net>:
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>
> 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"]
>