Index: khtml/khtml_settings.h
===================================================================
--- khtml/khtml_settings.h	(revision 1027233)
+++ khtml/khtml_settings.h	(revision 1027234)
@@ -186,7 +186,23 @@
     bool isPluginsEnabled( const QString& hostname = QString() ) const;
 
     // AdBlocK Filtering
+
+    /** tests whether @p url is filtered.
+     * @param url the URL to test.
+     * @return @c true if the URL is blacklisted and is not whitelisted.
+     */
     bool isAdFiltered( const QString &url ) const;
+
+    /** identify the filter which matches @p url.
+     * @param url the URL to test.
+     * @param isWhiteListed if not @c NULL, set to @c true if the URL matched
+     * a whitelist filter; set to @c false if it matched a blacklist filter.
+     * @return the filter string that matched,
+     * or @c QString() if no filter matched.
+     * @since 4.4
+    */
+    QString adFilteredBy( const QString &url, bool *isWhiteListed = 0 ) const;
+
     bool isAdFilterEnabled() const;
     bool isHideAdsEnabled() const;
     void addAdFilter( const QString &url );
Index: khtml/khtml_filter_p.h
===================================================================
--- khtml/khtml_filter_p.h	(revision 1027233)
+++ khtml/khtml_filter_p.h	(revision 1027234)
@@ -35,8 +35,9 @@
     // add filter to matching set
     void addString(const QString& pattern);
 
-    // check if string match at least one string from matching set
-    bool isMatched(const QString& str) const;
+    // check if string matches at least one string from matching set,
+    // optionally return the matching string or filter
+    bool isMatched(const QString& str, QString *by = 0) const;
 
     // add filter to matching set with wildcards (*,?) in it
     void addWildedString(const QString& prefix, const QRegExp& rx);
@@ -60,9 +61,10 @@
     // Parses and registers a filter. This will also strip @@ for exclusion rules, skip comments, etc.
     // The user does have to split black and white lists into separate sets, however
     void addFilter(const QString& filter);
-    
+
     bool isUrlMatched(const QString& url);
-    
+    QString urlMatchedBy(const QString& url);
+
     void clear();
 
 private:
Index: khtml/khtml_settings.cpp
===================================================================
--- khtml/khtml_settings.cpp	(revision 1027233)
+++ khtml/khtml_settings.cpp	(revision 1027234)
@@ -743,6 +743,27 @@
     return false;
 }
 
+QString KHTMLSettings::adFilteredBy( const QString &url, bool *isWhiteListed ) const
+{
+    QString m = d->adWhiteList.urlMatchedBy(url);
+    if (!m.isEmpty())
+    {
+        if (isWhiteListed != 0)
+            *isWhiteListed = true;
+        return (m);
+    }
+
+    m = d->adBlackList.urlMatchedBy(url);
+    if (!m.isEmpty())
+    {
+        if (isWhiteListed != 0)
+            *isWhiteListed = false;
+        return (m);
+    }
+
+    return (QString());
+}
+
 void KHTMLSettings::addAdFilter( const QString &url )
 {
     KConfigGroup config = KSharedConfig::openConfig( "khtmlrc", KConfig::NoGlobals )->group( "Filter Settings" );
Index: khtml/khtml_filter.cpp
===================================================================
--- khtml/khtml_filter.cpp	(revision 1027233)
+++ khtml/khtml_filter.cpp	(revision 1027234)
@@ -133,6 +133,25 @@
     return false;
 }
 
+QString FilterSet::urlMatchedBy(const QString& url)
+{
+    QString by;
+
+    if (stringFiltersMatcher.isMatched(url, &by))
+        return by;
+
+    for (int c = 0; c < reFilters.size(); ++c)
+    {
+        if (url.contains(reFilters[c]))
+        {
+            by = reFilters[c].pattern();
+            break;
+        }
+    }
+
+    return by;
+}
+
 void FilterSet::clear()
 {
     reFilters.clear();
@@ -196,12 +215,15 @@
     }
 }
 
-bool StringsMatcher::isMatched(const QString& str) const
+bool StringsMatcher::isMatched(const QString& str, QString *by) const
 {
     // check short strings first
     for (int i = 0; i < shortStringFilters.size(); ++i) {
         if (str.contains(shortStringFilters[i]))
+        {
+            if (by != 0) *by = shortStringFilters[i];
             return true;
+        }
     }
 
     int len = str.length();
@@ -235,13 +257,19 @@
                 if (index >= 0) {
                     int flen = stringFilters[index].length();
                     if (k - flen + 1 >= 0 && stringFilters[index] == str.midRef(k - flen + 1 , flen))
+                    {
+                        if (by != 0) *by = stringFilters[index];
                         return true;
+                    }
                 } else {
                     index = -index - 1;
                     int flen = rePrefixes[index].length();
                     if (k - 8 + flen < len && rePrefixes[index] == str.midRef(k - 7, flen) &&
                             str.indexOf(reFilters[index], k - 7 + flen) == k - 7 + flen)
+                    {
+                        if (by != 0) *by = rePrefixes[index]+reFilters[index].pattern();
                         return true;
+                    }
                 }
             }
         }