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@ 2019-03-04T23:53:18Z

<?php

$str = 'xxABC1xxxABC2xx';

if ( preg_match('/\d[A-Z]+x/', strrev($str), $match) )
    echo strrev($match[0]);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
strrev: documentation ( source)

preferences:dark modelive preview

27.62 ms | 402 KiB | 5 Q