Add suffix and removesuffix filters

core/modules/filters/removesuffix.js

@@ -0,0 +1,28 @@
+/*\
+title: $:/core/modules/filters/removesuffix.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for removing a suffix from each title in the list. Titles that do not end with the suffix are removed.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.removesuffix = function(source,operator,options) {
+	var results = [];
+	source(function(tiddler,title) {
+		if(title.substr(-operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+			results.push(title.substr(operator.operand.length));
+		}
+	});
+	return results;
+};
+
+})();

core/modules/filters/suffix.js

@@ -0,0 +1,36 @@
+/*\
+title: $:/core/modules/filters/suffix.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for checking if a title ends with a suffix
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.suffix = function(source,operator,options) {
+	var results = [];
+	if(operator.prefix === "!") {
+		source(function(tiddler,title) {
+			if(title.substr(-operator.operand.length).toLowerCase() !== operator.operand.toLowerCase()) {
+				results.push(title);
+			}
+		});
+	} else {
+		source(function(tiddler,title) {
+			if(title.substr(-operator.operand.length).toLowerCase() === operator.operand.toLowerCase()) {
+				results.push(title);
+			}
+		});
+	}
+	return results;
+};
+
+})();