<?php echo preg_replace('@(?=\pL)@u', '*', 'م'), PHP_EOL; // prints: '*م' ✓ echo preg_replace('@(?=\pL)@u', '*', 'ض'), PHP_EOL; // prints: '*ض' ✓ echo preg_replace('@(?=\pL)@u', '*', 'غ'), PHP_EOL; // prints: '*�*�' ✗ echo preg_replace('@(?=\pL)@u', '*', 'ص'), PHP_EOL; // prints: '*�*�' ✗
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