Add multi-bracket test for regex literals
Add multi-bracket test for regex literals

dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror