Issue 6927 - Expose pattern from RegExpFilter

lib/filterClasses.js

Index: lib/filterClasses.js
===================================================================
--- a/lib/filterClasses.js
+++ b/lib/filterClasses.js
@@ -165,21 +165,16 @@
 Filter.knownFilters = new Map();
 
 /**
  * Regular expression that content filters should match
  * @type {RegExp}
  */
 Filter.contentRegExp = /^([^/*|@"!]*?)#([@?$])?#(.+)$/;
 /**
- * Regular expression that RegExp filters specified as RegExps should match
- * @type {RegExp}
- */
-Filter.regexpRegExp = /^(@@)?\/.*\/(?:\$~?[\w-]+(?:=[^,\s]+)?(?:,~?[\w-]+(?:=[^,\s]+)?)*)?$/;
-/**
  * Regular expression that options on a RegExp filter should match
  * @type {RegExp}
  */
 Filter.optionsRegExp = /\$(~?[\w-]+(?:=[^,]*)?(?:,~?[\w-]+(?:=[^,]*)?)*)$/;
 /**
  * Regular expression that matches an invalid Content Security Policy
  * @type {RegExp}
  */
@@ -683,17 +678,17 @@
     // catch syntax errors
     let regexp = new RegExp(regexpSource.substr(1, regexpSource.length - 2),
                             this.matchCase ? "" : "i");
     Object.defineProperty(this, "regexp", {value: regexp});
   }
   else
   {
     // No need to convert this filter to regular expression yet, do it on demand
-    this.regexpSource = regexpSource;
+    this.pattern = regexpSource;
   }
 }
 exports.RegExpFilter = RegExpFilter;
 
 RegExpFilter.prototype = extend(ActiveFilter, {
   /**
    * @see ActiveFilter.domainSourceIsLowerCase
    */
@@ -718,29 +713,28 @@
   /**
    * @see ActiveFilter.domainSeparator
    */
   domainSeparator: "|",
 
   /**
    * Expression from which a regular expression should be generated -
    * for delayed creation of the regexp property
-   * @type {string}
+   * @type {?string}
    */
-  regexpSource: null,
+  pattern: null,
   /**
    * Regular expression to be used when testing against this filter
    * @type {RegExp}
    */
   get regexp()
   {
-    let source = filterToRegExp(this.regexpSource, this.rewrite != null);
+    let source = filterToRegExp(this.pattern, this.rewrite != null);
     let regexp = new RegExp(source, this.matchCase ? "" : "i");
     Object.defineProperty(this, "regexp", {value: regexp});
-    this.regexpSource = null;
     return regexp;
   },
   /**
    * Content types the filter applies to, combination of values from
    * RegExpFilter.typeMap
    * @type {number}
    */
   contentType: 0x7FFFFFFF,