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@ 2019-03-04T23:54:55Z

<?php

$str = 'xxABC1xxxABC2xx';

if ( preg_match('/x[A-Z]+\d(?!.*x[A-Z]+\d)/', $str, $match) )
    print_r($match[0]);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

52.96 ms | 1659 KiB | 5 Q