Relax URI template matcher.
diff --git a/uri-template.lisp b/uri-template.lisp
index c83709e..591b36e 100644
--- a/uri-template.lisp
+++ b/uri-template.lisp
@@ -374,6 +374,7 @@ URI-TEMPLATE."
(case-char op
(nil '(:alternation
(:property not-reserved-char-p)
+ (:char-class #\@)
(:sequence #\% :digit-class :digit-class)))
("+#./;?&" `(:alternation
(:property not-reserved-char-p)