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<?php $regex = "/(?<![\d.])(\d{1,2}'|\d{0,2}\.\d{1,2}')?(?![\d.](?=\d))/gm"; $string = "thee hight is 15'"; preg_match($regex,$string,$matches); var_dump($matches); ?>
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: preg_match(): Unknown modifier 'g' in /in/fOBXG on line 4 NULL
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: preg_match(): Unknown modifier 'g' in /in/fOBXG on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/fOBXG on line 4 array(0) { }

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