As I know "urn" cannot contain @
char.
Here is RFC link
service-URN = "URN:service:" service
service = top-level *("." sub-service)
top-level = let-dig [ *25let-dig-hyp let-dig ]
sub-service = let-dig [ *let-dig-hyp let-dig ]
let-dig-hyp = let-dig / "-"
let-dig = ALPHA / DIGIT
ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
DIGIT = %x30-39 ; 0-9
As I understanding allowed letters, digits and "-" char only.
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