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<?php echo preg_replace('`{[^{}]+}\((?>[^()]+|(?R))+\)`', '<$0>', 'test {22413}(ghfhgfhg(())sd(d)sf) sdfdsf {5}(45d4fsdf4)');
Output for 4.3.0 - 7.1.0
test {22413}(ghfhgfhg(())sd(d)sf) sdfdsf <{5}(45d4fsdf4)>