anchor.diff:  
     /// Enable or disable matching with ignoring case according to [enable] flag.
     ///
  +  /// Case sensitive matching is default.
     /// Returns this verbal expression object.
     ///
     /// Example:
  
positive.code:     return add(result);
    }
  
    VerbalExpression addModifier(String modifier) {
      return _applyModifier(modifier, true);
    }
  
    VerbalExpression removeModifier(String modifier) {
      return _applyModifier(modifier, false);
    }
  
negative.code: 
    bool _ignoreCase = false;
    bool _isMultiLine = true;
    bool _isGlobal = true;
  
    /// Escapes any non-word char with two backslashes used by any method, except [this.add]
    ///
  