Regex For Port Numbers In Android?

Consider a regex for testing port numbers. (6553[0-5]|655[0-2]\d|65[0-4]\d{2}|6[0-4]\d{3}|[1-5]\d{4}|[1-9]\d{0,3}) This is not valid in Android. Any idea what a port number regex

Solution 1:

Generally, regex isn't that great for numerical validation. I'd recommend using Integer.parseInt on a matched group and then check that to see if it's less than 65536.

Solution 2:

"(6553[0-5]|655[0-2]\\d|65[0-4]\\d{2}|6[0-4]\\d{3}|[1-5]\\d{4}|[1-9]\\d{0,3})" works on a Java Regex test page assuming that you are writing Java code. You probably have to escape the backslashes for the Java string literal to work. However, this expression does not thing that zero is a valid port number.

Solution 3:

It is old one, but in case someone is wondering how to use tryparse, a mentioned by one of developers:

int portNumber;
if (int.TryParse(inputPortValue, out portNumber)
    && portNumber >= 256
    && portNumber <= 0){
     error = "Invalid Port: " + inputPortValue
     ". Please verify.";
     returnfalse;
     }