diff --git a/core/modules/parsers/wikiparser/rules/extlink.js b/core/modules/parsers/wikiparser/rules/extlink.js
index 1bb663618..5f0246493 100644
--- a/core/modules/parsers/wikiparser/rules/extlink.js
+++ b/core/modules/parsers/wikiparser/rules/extlink.js
@@ -26,7 +26,7 @@ exports.types = {inline: true};
 exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
-	this.matchRegExp = /~?(?:file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|'"\\^~]+(?:\/|\b)/mg;
+	this.matchRegExp = /~?(?:file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|"\\^~]+(?:\/|\b)/mg;
 };
 
 exports.parse = function() {
diff --git a/core/modules/utils/utils.js b/core/modules/utils/utils.js
index 1226375eb..c23b79aee 100644
--- a/core/modules/utils/utils.js
+++ b/core/modules/utils/utils.js
@@ -495,7 +495,7 @@ exports.escapeRegExp = function(s) {
 
 // Checks whether a link target is external, i.e. not a tiddler title
 exports.isLinkExternal = function(to) {
-	var externalRegExp = /^(?:file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|'"\\^~]+(?:\/|\b)$/i;
+	var externalRegExp = /^(?:file|http|https|mailto|ftp|irc|news|data|skype):[^\s<>{}\[\]`|"\\^~]+(?:\/|\b)$/i;
 	return externalRegExp.test(to);
 };