<?php $text = "@keyframes animationName1{0%{opacity: 0}100%{opacity:1}}div{opacity:0}@keyframes animationName2{0%{opacity: 0}100%{opacity:1}}"; $rx = '~([^{}]+)({(?:[^{}]++|(\g<2>))*})~'; if (preg_match_all($rx, $text, $m)) { print_r($m[0]); }
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