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@ 2021-11-22T16:50:28Z

<?php

$str = '123.23.23.4/17,';
$str .= '123.23.23.4/23,';
$str .= '123.23.23.4/8,';
$str .= '123.23.23.4/18';

preg_match_all("~/\K(?:[1-9]|[12][0-9]|3[01])\b~", $str, $matches);
print_r($matches[0]);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
preg_match_all: documentation ( source)

preferences:dark modelive previewkey bindings

28.7 ms | 405 KiB | 5 Q