Regular Expression That Checks If a Number Is Prime (2016)

4 points by jagtodeath 6 years ago | 1 comment

jagtodeath 6 years ago |

A python implementation of is_prime(n):

  return re.compile(r'^1?$|^(11+)\1+$').match('1' * n) is None

Regular Expression That Checks If a Number Is Prime (2016) | Dark Hacker News