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<?php $str = 'xxABC1xxxABC2xx'; if ( preg_match_all('/x[A-Z]+\d/', $str, $matches, PREG_SET_ORDER) ) echo end($matches)[0];
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
xABC2

preferences:
136.95 ms | 407 KiB | 5 Q