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@ 2020-04-10T12:12:10Z

<?php

$useragent = "Mozilla/5.0 (iPhone; CPU iPhone OS 13_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148";
if (preg_match('/os\s+([0-9]+(?:_[0-9]+)*)/i', $useragent, $m)) {
   print_r($m);
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

27.13 ms | 402 KiB | 5 Q