docs: def result(self):
          """
          Construye la expresion
          """ 
          
          field = re.sub(REGEX_CLEANER, '', self.field)
  
          try:
              value = float(self.value)
          except TypeError:
          	value = "(%s)" % ( "', '".join(self.value) )
          except ValueError:
              value = str(self.value) \
                  .replace("\\", r"\\") \
                  .replace('"', r'\"') \
                  .replace("'", r"\'")
  
              value = "'%s'" % value
          
          res = "%s %s %s" % (field, self.operator, value)
  
          if self.conjunction:
              res = "%s %s" % (self.conjunction, res)
          
          return res