判断是否是电话号码

public static boolean isPhoneNumberValid(String phoneNumber) {
	   boolean isValid = false;
	   /*
	    * 可接受的电话格式有：
	    */
	   String expression = "^\\(?(\\d{3})\\)?[- ]?(\\d{3})[- ]?(\\d{5})$";
	   /*
	    * 可接受的电话格式有：
	    */
	   String expression2 = "^\\(?(\\d{3})\\)?[- ]?(\\d{4})[- ]?(\\d{4})$";
	   CharSequence inputStr = phoneNumber;
	   Pattern pattern = Pattern.compile(expression);
	   Matcher matcher = pattern.matcher(inputStr);
	   
	   Pattern pattern2 = Pattern.compile(expression2);
	   Matcher matcher2 = pattern2.matcher(inputStr);
	   if(matcher.matches() || matcher2.matches()) {
		   isValid = true;
	   }
	   return isValid;


   }