Auth TLS: Add _ to redirect RegEx. (#12326)

Co-authored-by: Marco Ebert <[email protected]>

internal/ingress/annotations/authtls/main.go

@@ -42,7 +42,7 @@ const (
 
 var (
 	authVerifyClientRegex = regexp.MustCompile(`^(on|off|optional|optional_no_ca)$`)
-	redirectRegex         = regexp.MustCompile(`^((https?://)?[A-Za-z0-9\-.]+(:\d+)?)?(/[A-Za-z0-9\-.]+)*/?$`)
+	redirectRegex         = regexp.MustCompile(`^((https?://)?[A-Za-z0-9\-.]+(:\d+)?)?(/[A-Za-z0-9\-_.]+)*/?$`)
 )
 
 var authTLSAnnotations = parser.Annotation{