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run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = 'ﺫﺫ'; var_dump(preg_replace('#(?:^[^\pL]+|[^\pL]+$)#u', '', $string));
Output for 4.4.0 - 4.4.9, 5.0.5 - 7.1.0
string(6) "ﺫﺫ"
Output for 5.0.0 - 5.0.4
<br /> <b>Warning</b>: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in <b>/in/69spo</b> on line <b>4</b><br /> NULL
Output for 4.3.11
<br /> <b>Warning</b>: preg_replace(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in <b>/in/69spo</b> on line <b>4</b><br /> NULL
Output for 4.3.0 - 4.3.10
<br /> <b>Warning</b>: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 7 in <b>/in/69spo</b> on line <b>4</b><br /> NULL