>
> if("%{User-Name}" =~ /\\\\?([^@\\\\]+)@?([-[:alnum:]._]*)?$/) {
>
I'm not that good with POSIX regex, but shouldn't it be
if("%{User-Name}" =~ /\\\\?([^@\\\\]+)@?([-[:alnum:]\._]*)?$/) {
AFAIK the dot "." means "any char" so I think it needs to be escaped.
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