diff --git a/src/js/codemirror/ubo-dynamic-filtering.js b/src/js/codemirror/ubo-dynamic-filtering.js
index a3c408f23..4d1d252cc 100644
--- a/src/js/codemirror/ubo-dynamic-filtering.js
+++ b/src/js/codemirror/ubo-dynamic-filtering.js
@@ -65,7 +65,7 @@ CodeMirror.defineMode('ubo-dynamic-filtering', ( ) => {
     };
 
     const isURLRule = ( ) => {
-        return /^[\w-_]+:\/\/[^/]+\//.test(tokens[1]);
+        return tokens[1].indexOf('://') > 0;
     };
 
     const skipToEnd = (stream, style = null) => {
@@ -132,7 +132,10 @@ CodeMirror.defineMode('ubo-dynamic-filtering', ( ) => {
                 return null;
             }
             // URL rule
-            if ( /[^a-z_-]+/.test(token) || invalidURLRuleTypes.has(token) ) {
+            if (
+                /[^a-z_-]/.test(token) && token !== '*' ||
+                invalidURLRuleTypes.has(token)
+            ) {
                 return skipToEnd(stream, 'error');
             }
             return null;
diff --git a/src/js/url-net-filtering.js b/src/js/url-net-filtering.js
index d6d44111b..aa6a9e232 100644
--- a/src/js/url-net-filtering.js
+++ b/src/js/url-net-filtering.js
@@ -340,8 +340,11 @@ URLNetFiltering.prototype.fromString = function(text) {
 
 URLNetFiltering.prototype.validateRuleParts = function(parts) {
     if ( parts.length !== 4 ) { return; }
-    if ( parts[1].indexOf('://') === -1 ) { return; }
-    if ( /[^a-z_-]+/.test(parts[2]) || knownInvalidTypes.has(parts[2]) ) {
+    if ( parts[1].indexOf('://') <= 0 ) { return; }
+    if (
+        /[^a-z_-]/.test(parts[2]) && parts[2] !== '*' ||
+        knownInvalidTypes.has(parts[2])
+    ) {
         return;
     }
     if ( nameToActionMap.hasOwnProperty(parts[3]) === false ) { return; }