How to sort inside a line starting from a precise pattern ?

I have a file with, e.g., 3 lines :

121021 Write about Paris with Chris @me &Paris @chris
121022 Phone to Inc and Gmbh &Gmbh @me &Inc
121029 Talk to Claire about placeholders @me @claire &Foo &Bar

The structure is the same :

- a date
- some text
- tags (appended from a Dictionary through a command)

The problem lies with the tags, which are unordered.

I would like to sort the line starting from @ or & patterns and reorder
(only) these patterns so as to have :

121021 Write about Paris with Chris @me @chris &Paris
121022 Phone to Inc and Gmbh @me &Inc &Gmbh
121029 Talk to Claire about placeholders @claire @me &Bar &Foo

(in fact I do not mind what comes first, @ or &)

I tried this solution :

:%call setline('.',join(sort(split(getline('.'),' ')),' '))

but, of course, it sorted the whole line, which was not what I was looking
for.

I had an idea (?!) :

- split the line on [@&]
- sort this part of the line separately
- re-join the 2 lines

The problem is I am not sure it is a good idea, and even if it was, I do not
know how to do that ...



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