Enumerable#split_where

split_where.rb

module Enumerable
  def split_where(&block)
    inject([[]]) do |result, item|
      if block.call(item)
        result.push []
      else
        result.last.push item
      end
      result
    end
  end
end

# Example: split an array of lorem words by any word starting with s

words = %w(lorem ipsum dolor sit amet consectetur adipisicing elit sed do eiusmod tempor incididunt ut labore et dolore magna aliqua ut enim ad minim veniam)
words.split_where{|word| word =~ /^s/} # => [["lorem", "ipsum", "dolor"], ["amet", "consectetur", "adipisicing", "elit"], ["do", "eiusmod", "tempor", "incididunt", "ut", "labore", "et", "dolore", "magna", "aliqua", "ut", "enim", "ad", "minim", "veniam"]]