docs: def search(self,q):
      """ Search. """
      import re
      pattern = re.compile("%s" % q)
      result = {}
      for i in self.allstockno:
        b = re.search(pattern, self.allstockno[i])
        try:
          b.group()
          result[i] = self.allstockno[i]
        except:
          pass
  
      return result