Created
November 2, 2024 13:55
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| import Foundation | |
| func isPrime(_ n: Int) -> Bool { | |
| return !String(repeating: "1", count: n).contains(/^.?$|^(..+?)\1+$/) | |
| } | |
| func isPrimeAlt(_ n: Int) -> Bool { | |
| let s = String(repeating: "1", count: n) | |
| return !s.contains(/^.?$|^(..+?)\1+$/) | |
| } | |
| isPrime(99) | |
| isPrime(100) | |
| isPrime(101) | |
| isPrime(102) |
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Swift version of: https://illya.sh/the-codeumentary-blog/regular-expression-check-if-number-is-prime/