Multi Split == Multi Recursion

msplit.rb

module MultiSplit
  def msplit(*delimiters)
    return [ self ] if delimiters.empty?

    if idx = index( delimiters.first )
      [ self[ 0...idx ] ] + self[ ( idx + delimiters.first.length )..-1 ].msplit( *delimiters )
    else
      msplit( *delimiters[1..-1] )
    end
  end
end

if $0 == __FILE__
  require "test/unit"
  String.send :include, MultiSplit

  class TestMultiSplit < Test::Unit::TestCase
    def test_msplit
      result = "abcdefghijklmnopqrstuvwxyz".msplit('a', 'c', 'mno', 'z')
      assert_equal [ '', 'b', 'defghijkl', 'pqrstuvwxy', '' ], result

      result = "abcdefabcef".msplit('b', 'e')
      assert_equal [ 'a', 'cdefa', 'c', 'f' ], result
    end
  end
end