3v4l.org

run code in 500+ PHP versions simultaneously
<?php $data = <<<DATA this will = ({match1}) this should = not ({match2}) ({match3}) DATA; $pattern = "~[^\w\s]\h*\K\({\w+}\)~"; preg_match_all($pattern, $data, $matches); print_r($matches[0]);

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23.27 ms | 476 KiB | 4 Q