I am not sure of the exact solution but I think there isn't any direct way for tag management.
A tag management tool's idea was created but I am not sure if it has been implemented.
The details: Tag management tool
There is a way to get all the tags from Db by using below query:
select tagname from jivetag order by tagname;
You can try Jive DB to get the tag names with the special characters which you want to modify and then update those tags as per your actual requirement!
E.g.select tagname from jivetag where tagname like'%-%' would give output: "pre-hire"
I hope it helps!
Thanks and regards,
Thanks Puja.. it is working