3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'fxs_124024574287414=base_domain=.example.com; datr=KWHazxXEIkldzBaVq_of--syv5; csrftoken=szcwad; ds_user_id=219132; mid=XN4bpAAEAAHOyBRR4V17xfbaosyN; sessionid=14811313756%12fasda%3A27; rur=VLL;'; echo preg_match('~ds_user_id=\K\d+~', $str, $out) ? $out[0] : 'no match';
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
219132
preferences:
111.21 ms | 403 KiB | 168 Q