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run code in 150+ php & hhvm versions
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<?php $text = 'пинг понг'; var_dump(preg_replace('/\W/u', '-', $text), preg_replace('/\PL/u', '-', $text));
Output for 5.3.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(17) "пинг-понг" string(17) "пинг-понг"
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.3.3
string(9) "---------" string(17) "пинг-понг"
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 1 in /in/YeMpR on line 5 string(9) "---------" NULL
Output for 4.3.3 - 4.3.10
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1 in /in/YeMpR on line 5 string(9) "---------" NULL
Output for 4.3.0 - 4.3.2
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 1 in /in/YeMpR on line 5 string(17) "-----------------" NULL