Issue 6927 - Expose pattern from RegExpFilter

lib/matcher.js

Index: lib/matcher.js
===================================================================
--- a/lib/matcher.js
+++ b/lib/matcher.js
@@ -17,17 +17,17 @@
 
 "use strict";
 
 /**
  * @fileOverview Matcher class implementing matching addresses against
  *               a list of filters.
  */
 
-const {Filter, WhitelistFilter} = require("./filterClasses");
+const {WhitelistFilter} = require("./filterClasses");
 
 /**
  * Blacklist/whitelist filter matching
  * @constructor
  */
 function Matcher()
 {
   this.clear();
@@ -107,30 +107,21 @@
   /**
    * Chooses a keyword to be associated with the filter
    * @param {Filter} filter
    * @return {string} keyword or an empty string if no keyword could be found
    */
   findKeyword(filter)
   {
     let result = "";
-    let {text} = filter;
-    if (Filter.regexpRegExp.test(text))
+    let {pattern} = filter;
+    if (pattern == null)
       return result;
 
-    // Remove options
-    let match = Filter.optionsRegExp.exec(text);
-    if (match)
-      text = match.input.substr(0, match.index);
-
-    // Remove whitelist marker
-    if (text[0] == "@" && text[1] == "@")
-      text = text.substr(2);
-
-    let candidates = text.toLowerCase().match(
+    let candidates = pattern.toLowerCase().match(
       /[^a-z0-9%*][a-z0-9%]{3,}(?=[^a-z0-9%*])/g
     );
     if (!candidates)
       return result;
 
     let hash = this.filterByKeyword;
     let resultCount = 0xFFFFFF;
     let resultLength = 0;