<?php $str = 'I1:1;I2:2;I8:2;NA1:5;IA1:[1,2,3,4,5];S1:asadada;SA1:[1,2,3,4,5];SA1:[1,2,3,4,5];'; preg_match_all('/;(.+?)\:/',$str,$matches); print_r($matches[1]);
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