<?php $re = '`(?:https?://\S+?/blah/|\G(?!^))(?:%2C)?\K\d+`m'; $str = 'https://test.example.com/blah/12345%2C80%2C8263473%2C9475834343'; preg_match_all($re, $str, $matches); print_r($matches[0]);
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