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@ 2019-04-06T14:48:41Z

<?php
$data = "The time is 1020 and the time is 1340 and 1550";

echo preg_replace('~\b\d{2}\K(?=\d{2}\b)~', ':', $data);

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

31.08 ms | 404 KiB | 5 Q