code: public void setValidCharRange(int minValidChar, int maxValidChar) {
  		if (minValidChar <= maxValidChar) {
  			this.minValidChar = minValidChar;
  			this.maxValidChar = maxValidChar;
  		} else {
  			this.maxValidChar = minValidChar;
  			this.minValidChar = maxValidChar;
  		}
  	}
docs: Change the range of the valid characters that should not be escaped.
  Any character outside the given range is automatically escaped.
  
  <p>If {@code maxValidChar} is lower or equal to zero, the invalid characters
  are not put within the result of the escaping.
  
  @param minValidChar the code of the minimal valid character.
  @param maxValidChar the code of the maximal valid character.