79756734

Date: 2025-09-05 11:43:13
Score: 2.5
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The answer is : (thx Hao Wu)

^\d{4,5}+(,\d{4,5}+)*+$

The + after \d{4,5} makes \d{4,5} possessive, I keep it to avoid backtracking to 4 numbers if 5 matched. The + after (,\d{4,5}+)* makes the group possessive so we keep progressing.

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Posted by: Calvarin Matthieu