问PHP在preg_替换上崩溃怎么办？

我使用以下脚本运行php.exe:

preg_replace('#(?:^[^\pL]*)|(?:[^\pL]*$)#u','',$string);

或相当于：

preg_replace('#(?:^[^\pL]*|[^\pL]*$)#u','',$string);

如果$string="S"或$string=" ذذ "如果这样的话string='ذ'它产生�这是不正确的，如果string='ذذ'PHP崩溃。

但它在4.4.0-4.4.9，5.0.5-5.1.6版本中工作。

怎么了？

见*http：//3v4l.org/T3rpV

<?php
$string='دد';
echo preg_replace('#(?:^[^\pL]*)|(?:[^\pL]*$)#u','',$string);

Output for 5.4.0 - 5.5.0alpha6

Process exited with code 139.

Output for 5.2.0 - 5.3.22, 5.5.0beta1

Output for 4.4.0 - 4.4.9, 5.0.5 - 5.1.6

دد

Output for 4.3.11, 5.0.0 - 5.0.4

Warning: preg_replace(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in /in/T3rpV on line 3

Output for 4.3.0 - 4.3.10

Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in /in/T3rpV on line 3