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@ 2018-04-26T13:38:54Z

<?php
$string = '["P4950Zp550","P4950Zp575","P4950Zp600","P5000Zp550","P5000Zp575","P5000Zp600","P4975Zp550","P4975Zp600"]';

if (preg_match('~^\["[PM]\d{3,5}Z[pm]\d{3,5}(?:","[PM]\d{3,5}Z[pm]\d{3,5}){7}"]$~', $string)) {
    echo "pass";
} else {
    echo "fail";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

153.71 ms | 404 KiB | 5 Q