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<?php $subject = "Helló"; $pattern = '/(l|ó){3,3}/'; preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 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
array(2) { [0]=> array(2) { [0]=> string(4) "lló" [1]=> int(2) } [1]=> array(2) { [0]=> string(2) "ó" [1]=> int(4) } }

preferences:
239.5 ms | 405 KiB | 345 Q