diff --git a/core/modules/filters.js b/core/modules/filters.js
index 15dde5f75..4c46b5283 100644
--- a/core/modules/filters.js
+++ b/core/modules/filters.js
@@ -108,7 +108,7 @@ exports.parseFilter = function(filterString) {
 		p = 0, // Current position in the filter string
 		match;
 	var whitespaceRegExp = /(\s+)/mg,
-		operandRegExp = /((?:\+|\-)?)(?:(\[)|("(?:[^"])*")|('(?:[^'])*')|([^\s\[\]]+))/mg;
+		operandRegExp = /((?:\+|\-)?)(?:(\[)|(?:"([^"]*)")|(?:'([^']*)')|([^\s\[\]]+))/mg;
 	while(p < filterString.length) {
 		// Skip any whitespace
 		whitespaceRegExp.lastIndex = p;