Does anyone know how to write a regexp that only allows a-zA-Z0-9.- (letters, numbers, dots, and dash) BUT that never starts or ends with a dot or dash ?

I tried this one :

/^[^.-][a-zA-Z0-9.-]+[^.-]$/

... but if I write something like "john@", it works, and I don't want to because @ is not allowed.

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