typeahead should escape regexp special chars

js/bootstrap-typeahead.js

@@ -109,7 +109,8 @@
     }
 
   , highlighter: function (item) {
-      return item.replace(new RegExp('(' + this.query + ')', 'ig'), function ($1, match) {
+      var query = this.query.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&')
+      return item.replace(new RegExp('(' + query + ')', 'ig'), function ($1, match) {
         return '<strong>' + match + '</strong>'
       })
     }

js/tests/unit/bootstrap-typeahead.js

@@ -52,6 +52,22 @@ $(function () {
         typeahead.$menu.remove()
       })
 
+      test("should not explode when regex chars are entered", function () {
+        var $input = $('<input />').typeahead({
+              source: ['aa', 'ab', 'ac', 'mdo*', 'fat+']
+            })
+          , typeahead = $input.data('typeahead')
+
+        $input.val('+')
+        typeahead.lookup()
+
+        ok(typeahead.$menu.is(":visible"), 'typeahead is visible')
+        equals(typeahead.$menu.find('li').length, 1, 'has 1 item in menu')
+        equals(typeahead.$menu.find('.active').length, 1, 'one item is active')
+
+        typeahead.$menu.remove()
+      })
+
       test("should hide menu when query entered", function () {
         stop()
         var $input = $('<input />').typeahead({