From: Robert Klemme <bob.news@...>
Date: 2004-09-23T17:49:34+09:00
Subject: Re: whitespace string only


"Henrik Horneber" <ryco@gmx.net> schrieb im Newsbeitrag
news:4152820A.9080408@gmx.net...
> Hi!
>
> What's the best way to test if a string only consists of whitespaces and
> newlines?
>
> best I could come up with is
>
>
> class String
>
>    def is_whitespace_only?
>      strings_to_test = split("\n")
>      whitespace = /^\s+$/
>      is_whitespace_only = true
>      strings_to_test.each{ |str|
>        unless whitespace.match(str) or str.empty?
>          is_whitespace_only = false
> break
>        end
>      }
>      is_whitespace_only
>    end
>
> end
>
> But somehow I think there should be a better way to do it. Any ideas?
> Is it okay to add such methods to class String itself?
>
> Any advices appreciated.
>
> regards,
> Henrik
>
>

>> rx = %r{\A\s*\z}
=> /\A\s*\z/
>> rx =~ ""
=> 0
>> rx =~ "  "
=> 0
>> rx =~ "  a"
=> nil
>> rx =~ "  \n a"
=> nil
>> rx =~ "  \n "
=> 0
>> rx =~ "  \n \n"
=> 0

Regards

    robert