_setDefaults(regexp) {
    // When a repetitional token has its max set to Infinite,
    // randexp won't actually generate a random amount between min and Infinite
    // instead it will see Infinite as min + 100.
    this.max = regexp.max != null ? regexp.max :
      RandExp.prototype.max != null ? RandExp.prototype.max : 100;

    // This allows expanding to include additional characters
    // for instance: RandExp.defaultRange.add(0, 65535);
    this.defaultRange = regexp.defaultRange ?
      regexp.defaultRange : this.defaultRange.clone();

    if (regexp.randInt) {
      this.randInt = regexp.randInt;
    }
  }
Checks if some custom properties have been set for this regexp.

@param {RandExp} randexp
@param {RegExp} regexp