original_string: public static function normalize($pattern)
  	{
  		//normalize the string pattern and return safe pattern for use
  		return self::$delimiter.trim($pattern, self::$delimiter).self::$delimiter;
  
  	}
code: public static function normalize($pattern)
  	{
  		//normalize the string pattern and return safe pattern for use
  		return self::$delimiter.trim($pattern, self::$delimiter).self::$delimiter;
  
  	}
code_tokens: public static function normalize ( $ pattern ) { //normalize the string pattern and return safe pattern for use return self :: $ delimiter . trim ( $ pattern , self :: $ delimiter ) . self :: $ delimiter ; }
docstring: This method normalizes the regular expression pattern before we use it
  
  @param string $pattern The regular expression string to be used
  @return string Normalized/Sanitized regular expression string
  @throws This method does not throw an error
docstring_tokens: This method normalizes the regular expression pattern before we use it