From: kjana@...4lab.to (YANAGAWA Kazuhisa)
Date: 2002-09-24T12:25:48+09:00
Subject: Re: another easy one...

In message <5.1.0.14.2.20020923141722.04f2ba40@zcard04k.ca.nortel.com>
probertm@nortelnetworks.com writes:

> $ cat blah.rb
> c = "C"
> case c
>          when c =~ /[A-Za-z0-9_]/
>                  puts "yip!"
>          else
>                  puts "nope..."
> end
> 
> $ ruby !$
> ruby blah.rb
> nope...
> 
> $ ruby -v
> ruby 1.7.2 (2002-07-02) [i386-mswin32]

On a case statement, `when foo' does equality check by foo.===.  In
your code this means `(Fixnum or nil) === c', that's not your
intension, is it?


Case matching against Regexp should be written:

    case c
    when /[A-Za-z0-9_]/
      puts "match"
    else
      puts "nope!"
    end

where /[A-Za-z0-9_]/.===, that's mere alias of Regexp#=~, will be
called.


-- 
kjana@dm4lab.to                             September 24, 2002
No gains without pains.