刚刚找到了解决方案 here 。以下正则表达式正确工作：

  g / ^ \（。* \）$ \\\
\1 $ / d 
 

This question already addresses how to remove duplicate lines, but enforces that the list is sorted first.

I would like to perform the remove contiguous duplicate lines step (i.e. uniq) without first sorting them.

Example before:

Foo
Foo
Bar
Bar

Example after:

Foo
Bar

Just found the solution here. The following regex works correctly:

g/^\(.*\)$\n\1$/d