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@ 2014-09-10T10:15:27Z

<?php
$regex = "/(?<![\d.])(\d{1,2}'|\d{0,2}\.\d{1,2}')?(?![\d.](?=\d))/";
$string = "thee hight is 15'";
preg_match_all($regex,$string,$matches);
var_dump($matches);
?>

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match_all: documentation ( source)

preferences:dark modelive preview

43.5 ms | 402 KiB | 5 Q