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run code in 150+ php & hhvm versions
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<?php setlocale(LC_ALL, 'ru_RU.cp1251'); echo preg_replace ( '/[^\p{L}\d]/', '_', 'ёйцукенгшщзхъфывапролджэячсмитьбю1234567890' );
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
�_�_�_�_ке�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_�_1234567890
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 3 in /in/XLLq8 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 3 in /in/XLLq8 on line 3