From: "Peña, Botp" <botp@...>
Date: 2007-09-25T16:16:12+09:00
Subject: Re: Extract numbers from string

From: Nicholas Clare [mailto:nickclare@gmail.com] 
# new_num = old_num.scan(/\d/).join('')
                          lose this ^^

irb(main):003:0> old_num.scan(/\d/).join
=> "5551115555"

also,

irb(main):014:0>  old_num.gsub(/[^\d]/,"")
=> "5551115555"
irb(main):015:0>  old_num.tr("^0-9","")
=> "5551115555"
irb(main):018:0>  old_num.delete("^0-9")
=> "5551115555"
irb(main):025:0>  old_num.split(/[^\d]/).join
=> "5551115555"

i'd hope that ruby-doc can doc such related methods.. something like documenting "The Many-Ways" of ruby...

kind regards -botp