3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = "The time is 1020 and the time is 1340 and 1550"; $data = preg_replace('/\b(\d{2})(\d{2})\b/', "$1:$2", $data); echo $data;

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103.59 ms | 1615 KiB | 5 Q