<?php $str = <<<'EOD' NW Brockville Se Nashville N Brockville S Nashville E Brockville W Nashville PE Springfield Kr Nashville Sete Nevers EOD; echo preg_replace_callback('~^([ns]?[ew]?\b ?)(?:^[a-z]{2} )?~mi', fn($m) => strtoupper($m[1]), $str);
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