2. The method of claim 1 , wherein the first preset rule includes: returning a corresponding result and using the corresponding result as a first partial regular expression when the first character string satisfies a second preset rule.
2. The method of claim 1 , wherein the first preset rule includes: returning a corresponding result and using the corresponding result as a first partial regular expression when the first character string satisfies a second preset rule. 7. The method of claim 2 , wherein the second preset rule includes: returning a fourth preset identifier when the first character string is empty.