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<?php function format(string $rawPath): string { preg_match_all('/([^\[;^\]]+)|(\[[^[]+])/', $rawPath, $matches); $groups = reset($matches); if ($groups === false) { $groups = []; } $root = trim((array_shift($groups) ?? ''), '[]'); return array_reduce( $groups, static fn (string $path, string $part): string => ( $path . '[' . trim($part, '[ ]') . ']' ), $root ); } echo format('hello[0]world[1]kiss.log');