vim中把用正则表达式匹配的字符串写到一个新文件的方法

redirect selected parts to a new file
1:  :g/patten/y A   Append to the
                     contents of the register if its name is given
                     uppercase {A-Z}
     create a file in vim
     "ap
2:delete unwanted lines
     :g/^[^0-9]\+\n/d
3:   :redir >> tmp
     :g/^\d\+/p
     :redir END
  "send output of previous global command to a new window
     :nmap <F5>  :redir @a<CR>:g//<CR>:redir END<CR>:new<CR>:put! a<CR><CR>

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