<?php $str = "23 St John Apt 92 rer 4, Wellington Country Block 5 No value test 54545 tt 232"; echo preg_replace_callback( '/\b(?:Ap(?:artmen)?t|Block|Department|Lot|Number|Villa)\s*\K\d{1,3}\b/i', fn($m) => sprintf('%04s', $m[0]), $str );
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