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<?php $subject = "Helló"; $pattern = '/(l|ó){2,3}/'; preg_match($pattern, substr($subject,3), $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { [0]=> array(2) { [0]=> string(3) "ló" [1]=> int(0) } [1]=> array(2) { [0]=> string(2) "ó" [1]=> int(1) } }

preferences:
272.48 ms | 406 KiB | 368 Q