gistfile1.ru

# Usage:
#   Returns the index of the first element of the array
#   that matches the regular expression provided
#
# lines.index_regex(/\d{4}\-\d{2}\-\d{2}/)
#
class Array
  def index_regex(pattern)
    self.each_with_index do |value,index|
      return index if pattern.match(value)
    end
  end
end