1--TEST-- 2Bug #79363 (\p{L} doesn't work alongside \p{Arabic} in a character class) 3--FILE-- 4<?php 5$str = 'lower UPPER'; 6var_dump(preg_replace('/[\p{L}\p{Arabic}]/', '0', $str)); 7var_dump(preg_replace('/[^\p{L}\p{Arabic}]/', '0', $str)); 8?> 9--EXPECT-- 10string(11) "00000 00000" 11string(11) "lower0UPPER" 12