anchor.diff:    }
   
     /**
  -   * Add pattern.
  +   * Add pattern
      */
     addPattern(pattern) {
       if (pattern == null) {
  
positive.code:   }
  
    /**
     * Repeat least once. [a-z] -> [a-z]+
     */
    repeatLeastOnce() {
      _repeatingSuffix += "+";
    }
  
    /**
     * Maybe exists. [a-z] -> [a-z]?
     */
    maybe() {
      _repeatingSuffix += "?";
  
negative.code: part of objective_regex;
  
  /**
   * Regex pattern object
   */
  class RPattern {
  
  