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<?php function check($value) { return (bool)preg_match('/(\p{Cyrillic}){1}/', $value); }; $test = 'ะค'; var_dump(check($test));
Output for 4.4.3 - 4.4.9, 5.1.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for 4.4.0 - 4.4.2, 5.0.5 - 5.1.2
Warning: preg_match(): Compilation failed: unknown property name after \P or \p at offset 12 in /in/I2FR5 on line 5 bool(false)
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 2 in /in/I2FR5 on line 5 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 2 in /in/I2FR5 on line 5 bool(false)