crappy solution for parsing sources from a string

gistfile1.txt

require 'uri'

a = %{rubygems repository http://blahblah.net/, https://rubygems.org/}

b = a.split().inject([]) {|array, string| 
  begin
	  x = URI.parse(string).absolute?
	  array << string if x
  rescue
  end
  array
}

puts b

# ALTERNATIVELY, just use this line

b = a.split().select {|x| x if URI.parse(x).absolute?}