I tried to submit a question with two sets of tags, entered like this:
However, when I submitted the question and after I'd gone through the CAPTCHA, I was presented with these two errors:
- must include one of these tags -- 'bug feature-request discussion support'
- users with less than 500 reputation can't create new tags. The tag 'user-accountsdiscussion' is new. Try using an existing tag instead.
It appears Stack Overflow stripped the square brackets from my tags. The documentation doesn't state that anything special is require to concatenate tags together, so I didn't go with spaces or commas or the like.
I'd posit that non-delimited tags should work fine given the square brackets themselves act as delimiters.