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run code in 150+ php & hhvm versions
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<?php echo preg_replace('`{([^{}]*|{[^{}]*})+}`', '<$0>', 'test {a} {b{c}d}e{{f}{g}}');
Output for 4.3.0 - 7.1.0
test <{a}> <{b{c}d}>e<{{f}{g}}>