<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _val_fs_regex(self, record, hist=None):
 """ Perform field-specific validation regex :param dict record: dictionary of values to validate :param dict hist: existing input of history values """


        record, hist = self.data_regex_method(fields_list=self.fields,
                                              mongo_db_obj=self.mongo,
                                              hist=hist,
                                              record=record,
                                              lookup_type='fieldSpecificRegex')
        return record, hist