Fun with to_proc

fun_with_to_proc.rb

class Regexp
  def to_proc
    proc {|str| match(str) && $~.to_s }
  end
end

arr = [ "foo", "bar 123", "baz", "456", "789 qux" ]

p arr.find(&/bar/) # => "bar 123"

exp = /\d+/
p arr.select(&exp) # => [ "bar 123", "456", "789 qux" ]
p arr.map(&exp)    # => [ nil, "123", nil, "456", "789" ]