class ReUtil: need_escape = { '\\': True, '^': True, '$': True, '.': True, '*': True, '+': True, '?': True, '{': True, '}': True, '(': True, ')': True, '[': True, ']': True, '|': True, } exits = {}

@classmethod def get_regex(cls, begin_with=None, must_contain=None, end_with=None) -> 're object': begin_with = cls.conver_to_list(begin_with) must_contain = cls.conver_to_list(must_contain) end_with = cls.conver_to_list(end_with)

pattern = '' pattern += cls.list_to_restring(begin_with) pattern += '(.*)?' pattern += cls.list_to_restring(must_contain) pattern += '(.*)?' pattern += cls.list_to_restring(end_with)

if cls.exits.get(pattern): return cls.exits[pattern] regex_obj = re.compile(pattern, re.DOTALL) cls.exits[pattern] = regex_obj return regex_obj

@classmethod def list_to_restring(cls, args: list) -> 'str': ans = '((?i)' # ignore capitals for i, arg in enumerate(args): for j in range(len(arg)): if arg[j] in cls.need_escape: ans += '\\' ans += arg[j] if i != len(args) - 1: ans += '|' ans += ')' return ans

@classmethod def conver_to_list(cls, value) -> 'list': return [] if not value else [value] if not isinstance(value, list) else value

@classmethod def get_all_number_to_list(cls, string): return re.findall('\d+\.?\d*', string)