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run code in 150+ php & hhvm versions
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<?php echo preg_replace('`{[^{}]+}(\((?>[^()]+|(?2))+\))`', '<$0>', 'test {22413}(ghfhgfhg(())sd(d)sf) sdfdsf {5}(45d4fsdf4)');
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Compilation failed: reference to non-existent subpattern at offset 24 in /in/X2XHO on line 2
Output for 4.3.0 - 4.3.10, hhvm-3.12.0
Warning: Compilation failed: reference to non-existent subpattern at offset 24 in /in/X2XHO on line 2
Output for hhvm-3.10.0
Warning: Compilation failed: reference to non-existent subpattern at offset 24 in /in/X2XHO on line 8