Online PHP editor | output for aTo3V

@ 2020-03-01T23:11:01Z

<?php

$strs = ["NLNL LL","LNLN LL LL","NNLL LL LL LL","LNLN LLL LL","LLNN LL LLL"];
foreach ($strs as $s) {
    echo "----------------------------\n$s\n";
    if (preg_match('~(?:\s[A-Z]{2})+$~', $s, $match)) {
        print_r(explode(" ",trim($match[0])));
    }
    if (preg_match_all('~(?:\G(?!\A)|(?=(?:\s[A-Z]{2})+$))\s\K[A-Z]{2}~', $s, $matches)) {
        print_r($matches[0]);
    }
    
}

Output for 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 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13: ---------------------------- NLNL LL Array ( [0] => LL ) Array ( [0] => LL ) ---------------------------- LNLN LL LL Array ( [0] => LL [1] => LL ) Array ( [0] => LL [1] => LL ) ---------------------------- NNLL LL LL LL Array ( [0] => LL [1] => LL [2] => LL ) Array ( [0] => LL [1] => LL [2] => LL ) ---------------------------- LNLN LLL LL Array ( [0] => LL ) Array ( [0] => LL ) ---------------------------- LLNN LL LLL

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