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run code in 150+ php & hhvm versions
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<?php $value = " "; var_dump(preg_match('/^[\pL\s]+$/u', $value));
Output for 4.4.0 - 4.4.9, 5.0.5 - 7.1.0
int(1)
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 3 in /in/XYUc4 on line 3 bool(false)
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 3 in /in/XYUc4 on line 3 bool(false)