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<?php $regex = "/(?<![\d.])(\d{1,2}'|\d{0,2}\.\d{1,2}')?(?![\d.](?=\d))/"; $string = "thee hight is 15'"; preg_match($regex,$string,$matches); var_dump($matches); ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(0) "" }

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