<?php
$string = "FORT/310117/200826/12979898000170";
preg_match_all("/(?<d6>\b\d{6}\b)|(?<d14>\b\d{14}\b)/", $string, $matches);
$d14 = preg_grep('/.{1,}/', $matches['d14']);
if($d6 && $d14){
$d6_1 = $d6[0];
$d6_2 = $d6[1];
echo $d6_1 ." / ". $d6_2 . " / ". $d14;
}
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