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run code in 150+ php & hhvm versions
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<?php $string='دد'; echo preg_match('#(?:^[^\pL]*)|(?:[^\pL]*$)#u',$string,$t); var_dump($t);
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1array(1) { [0]=> string(0) "" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11, 5.0.0 - 5.0.4
Warning: preg_match(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in /in/p37mf on line 3 array(0) { }
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/p37mf on line 3 array(0) { }