Regex expression for a discord username

I cannot seem to find it perfectly, so that's why I'm asking here. What would be the regex expression for the new discord usernames ?

From what I know, they must not contain "@", "#", ":", "```" or "discord". The username cannot be exactly "everyone" nor "here". Whitespaces cannot be put twice in a row, your username cannot start nor end with a whitespace, and I guess that it checks the "only whitespace" case.

I've already tried something, but I cannot really conclude

/^(?!(?:@|```|:|#|discord))$/ // For the "not contain"
/^([^\s].*[^\s])$/ // For the not start/end with whitespace

Solution

You can use

^(?=.{2,32}$)(?!(?:everyone|here)$)\.?[a-z0-9_]+(?:\.[a-z0-9_]+)*\.?$

See the regex demo.

Details:

^ - start of string
(?=.{2,32}$) - the string must contain two to thirty-two chars
(?!(?:everyone|here)$) - the string cannot be equal to "everyone" or "here"
\.? - an optional dot
[a-z0-9_]+ - one or more lowercase letters/digits/underscores
(?:\.[a-z0-9_]+)* - zero or more sequences of a . and then one or more lowercase letters/digits/underscores
\.? - an optional dot
$ - end of string.