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run code in 200+ php & hhvm versions
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<?php preg_match_all('/\[(.+?):.*\]/', 'text [Иванов, Петров 1992: 32] text [Иванов2, Петров2 19922: 32] text', $matches); print_r($mathces);
Output for 5.0.4 - 7.1.7
Notice: Undefined variable: mathces in /in/uLtBF on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: mathces in /in/uLtBF on line 3