remove small mistake in regex handling

backend/routes/routesToucan.js

@@ -129,7 +129,7 @@ router.get('/pdf/:year/:title', (req, res) => {
     var title = req.params.title;
     var year = parseInt(req.params.year);
     var nextyear = year + 1;
-    var title = new RegExp((title.split("-")).join("."));
+    title = new RegExp('^'+(title.split("-")).join(".")+'$');
     console.log(title);
 
     Toucan.find(