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A comment on Regular Expression That Checks If a Number Is Prime (2016).

Re:Regular Expression That Checks If a Number Is Prime (2016) by jagtodeath on Sunday December 29, 2019 @06:21PM (#21909349)
A python implementation of is_prime(n):

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