def extractNumber str
      match = STDNUMPAT.match str
      return nil unless match
      return (match[1].gsub(/\-/, '')).upcase
    end
def extractNumber str
      match = STDNUMPAT.match str
      return nil unless match
      return (match[1].gsub(/\-/, '')).upcase
    end
def extractNumber str match = STDNUMPAT . match str return nil unless match return ( match [ 1 ] . gsub ( / \- / , '' ) ) . upcase end
Extract the most likely looking number from the string. This will be the first
 string of digits-and-hyphens-and-maybe-a-trailing-X, with the hypens removed
 @param [String] str The string from which to extract an ISBN/ISSN
 @return [String] The extracted identifier
Extract the most likely looking number from the string . This will be the first string of digits - and - hyphens - and - maybe - a - trailing - X with the hypens removed