broken_regex.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'sinatra'

# this fails matching /2009/04/30/borland-c++-builder-5-how-i-hate-thee
get %r|^/\d{4}/\d{2}/\d{2}/[\w\d\-+]+$| do |match|
  p match
end

broken_regex2.rb

#!/usr/bin/env ruby

link = '/2009/04/30/borland-c++-builder-5-how-i-hate-thee'
regex = %r|^/\d{4}/\d{2}/\d{2}/[\w\d\-+]+$|

# this works
p link =~ regex
p link.match(regex)