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<?php echo preg_replace('`[^{}]*\K{[^{}]*}[^{}]*`', '<$0>', 'test {a} {b{c}d}e{{f}{g}}');
Output for git.master, git.master_jit, rfc.property-hooks
test <{a} >{b<{c}d>}e{<{f}><{g}>}

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