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<?php $str = "ab9c5lek94ke2koe8nsk9"; echo preg_replace('/(\d)([^\d]*)(\d)([^\d]*)(\d)([^\d]*)$/',"<b>$1</b>$2<b>$3</b>$4<b>$5</b>$6",$str);
Output for git.master, git.master_jit, rfc.property-hooks
ab9c5lek94ke<b>2</b>koe<b>8</b>nsk<b>9</b>

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