code: public boolean isEscapeChar(final CharSequence buffer, final int pos) {
  		if (pos < 0) {
  			return false;
  		}
  
  		for (int i = 0; (escapeChars != null) && (i < escapeChars.length); i++) {
  			if (buffer.charAt(pos) == escapeChars[i]) {
  				return !isEscaped(buffer, pos); // escape escape
  			}
  		}
  
  		return false;
  	}
docs: Check if this character is a valid escape char (i.e. one that has not been escaped)