At Tue, 19 Dec 2000 19:40:02 +0900,
Conrad Schneiker wrote:

> On page 10 of PR [Programming Ruby] the %w shortcut is shown creating an
> array with curly braces (a=%w{a d c f}) which works. The same construction
> also works with square brackets [which] seems more consistant with arrays.
> This is a bit confusing since it isn't mentioned in the text.

see p202 "General Delimited Input"

It can be any char.
e.g

a = %w- a d c f -
--
          yashi