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<?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 for git.master, git.master_jit, rfc.property-hooks
The time is 10:20 and the time is 13:40 and 15:50

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