Fixed issue #322 by changing the keyword regex to allow numbers in any but the first character.

test/less/css-3.less

@@ -53,3 +53,7 @@ form[data-disabled] {
 p::before {
   color: black;
 }
+
+#issue322 {
+  -webkit-animation: anim2 7s infinite ease-in-out;
+}