code: def locate(self, pattern, big_endian=False):
          
          space, self.space = tee(self.space)
          if pattern.startswith('0x'):
              target = unhexlify(
                  pattern[2:].encode('utf-8')).decode('utf-8')
              if not big_endian:
                  target = target[::-1]
          else:
              target = pattern
          for index, one in enumerate(window(space, self.position)):
              if ''.join(one) == target[:self.position]:
                  return index
          raise KeyError('{target} Not Found In {sets}!'.format(
              target=pattern, sets=self.sets))
docs: Locate the pattern.