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<?php $part = 'Никита'; var_dump((bool)preg_match('/^([A-Za-zА-Яа-я]+){1}$/u', $part));
Output for 4.3.3 - 5.6.26, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
bool(true)
Output for 4.3.0 - 4.3.2
bool(false)