From: Reimer Behrends <behrends@...>
Date: 2003-06-30T10:00:35+09:00
Subject: Re: Regexp#options (RCR #43)

Daniel Berger (djberg96@yahoo.com) wrote:
[...]
>  # example using longhand
>  irb(main):001:0> r =
>  Regexp.new(/\w+/,Regexp::EXTENDED)
>  (irb):1: warning: flags ignored
> => /\w+/

Try

	Regexp.new("\\w+", Regexp::EXTENDED)

There's really only a point to giving flags when you compile a
string; if you pass a regular expression, you can already provide
the flags.

>  # example using shorthand
>  irb(main):002:0> r.options
> => 0irb(main):003:0> r = /\w+/xi
> => /\w+/ix
>  irb(main):004:0> r.options
> => 3

Regexp#options returns the logical or of all flags.

>  My guess is that it's returning length + 1, instead of
>  the options themselves.  If my opinion carries any
>  weight, I would like r.options (using the last
>  example) to return ["x","i"].

class Regexp
  def verbose_options
    opts = options
    result = []
    for i, name in [[IGNORECASE, "i"], [EXTENDED, "x"], [MULTILINE, "m"]] do
      if (opts & i) != 0 then
        result << name
      end
    end
    result
  end
end

				Reimer Behrends