Fetch errors in URL regular expressions creation

Fixes #581

lib/settingContainers.js

@@ -174,7 +174,16 @@
 			);
 		}
 		else {
-			regExp = new RegExp(urlSetting.url, "i");
+			try {
+				regExp = new RegExp(urlSetting.url, "i");
+			}
+			catch (error){
+				logging.error("Error in regular expression", urlSetting.url, error);
+				regExp = new RegExp(
+					"(?:^|\\.)" + urlSetting.url.replace(/([\\+*?[^\]$(){}=!|.])/g, "\\$1") + "\\.?$",
+					"i"
+				);
+			}
 		}
 		const match = function(url){
 			if (!url){

releaseNotes.txt

@@ -6,7 +6,7 @@ Version 1.8:
 		- added SVG protection
 	
 	fixes:
-		- 
+		- errors in URL regular expressions broke CB
 	
 	known issues:
 		- if a data URL is blocked the page action button does not appear