code: protected static function extractMessageVersion($fullVersionString)
      {
          $marker = strpos($fullVersionString, '_', strpos($fullVersionString, '_') + 1);
  
          $num = substr($fullVersionString, $marker + 1);
  
          return str_replace('_', '.', $num);
      }
docs: extractMessageVersion
  
  extracts "4.1" from a string like "Security_SignOut_4_1"
  or "1.00" from a string like "tns:AMA_MediaGetMediaRQ_1.000"
  
  @param string $fullVersionString
  @return string