正则表达式 – 忽略除一个子文件夹之外的目录中的所有内容

ignore = Regex /root/path/to/music/.*
ignorenot Regex /root/path/to/music/sfx/.*

Documentation Source

There is also an ignorenot preference,which specifies a set of
patterns for paths that should not be ignored,even if they match an
ignore pattern. However,the interaction of these two sets of patterns
can be a little tricky. Here is exactly how it works:

• Unison starts detecting updates from the root of the replicas—i.e.,from the empty path. If the empty path matches an ignore pattern and
  does not match an ignorenot pattern,then the whole replica will be
  ignored. (For this reason,it is not a good idea to include Name *
  as an ignore pattern. If you want to ignore everything except a
  certain set of files,use Name ?*.)

• If the root is a directory,Unison continues looking for updates in all the immediate children of the root. Again,if the name of some
  child matches an ignore pattern and does not match an ignorenot
  pattern,then this whole path including everything below it will be
  ignored.

• If any of the non-ignored children are directories,then the process continues recursively.