import re import unittest class RegEx(unittest.TestCase): pattern_phone = re.compile(r'\D') pattern_digits_only = re.compile(r'\d') def test_phone(self): m = self.pattern_phone.sub('','+1 (212) 555-6832') self.assertIsNotNone(self.pattern_digits_only.match(m)) print(f'm={m}') if __name__ == '__main__': unittest.main()