fix regex parser error

parse.cm

@@ -357,7 +357,11 @@ var parse = function(tokens, src, filename) {
       }
       node.pattern = pattern_str
       if (length(flags) > 0) node.flags = flags
-      advance()
+      // Skip all tokens consumed by the regex re-scan
+      while (true) {
+        advance()
+        if (tok.kind == "eof" || tok.at >= rpos) break
+      }
       ast_node_end(node)
       return node
     }