我们使用一个正则表达式来捕获每个块，并与它的开头相匹配，然后删除它并粘贴到文件的开头。

:$put _ | g/^## 202006[2-3][890]/normal! dapggP

:$put _部分用于在末尾添加一个空行，因此每个块后面都有一个空行。

: .................... vim command mode
$ .................... at end of the file
_ .................... a blank line
|  ................... another vim command
g  ................... a global command
/  ................... start of a search
^  ................... every start of the line

## .................. two literal ##

202006 ............... literal numbers 
[2-3]  ............... followed by 2 until 3
[890]  ............... followed by 8 9 or zero
/ .................... end of the search
normal! .............. a normal command
dap .................. delete a paragraph
gg ................... jump to the beginning of the file
P .................... put deleted text before the cursor