anchor.diff:    }
   
     /**
  -   * Add pattern.
  +   * Add pattern
      */
     addPattern(pattern) {
       if (pattern == null) {
  
positive.code:   String _repeatingSuffix = "";
  
    /**
     * Convert the expression to class. "[a-z]" -> [a-z] [a-z]{1, 2}
     */
    repeat({int count : 0, int minCount : 0, int maxCount : 0}) {
      if (count > 0) {
  
negative.code: part of objective_regex;
  
  /**
   * Regex pattern object
   */
  class RPattern {
  
  