I want to force people to use certain format for their username when they register to Jira.
This is needed because the server is using several external authentications directories and I want to be sure that they do not overlap.
You'll need to add some code to the account creation process to do this. I've not seen any plugins that will do it - most of the time people delegate the whole thing to the other system(s) so the accounts are handled automatically.
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