Excellent solution. You have great domain of re module and its methods

You can use join method for all the items within the list except for the last one >>>> use slice notation
and then insert the '&'

You are only returning a name cause your aren't collecting the names. When you return z, you only retrieve the very last value of it.
However, the "return z" expression is within the for cicle and it's executed in the first iteration.
Hope help you!