常用正则表达式

1、端口号正则 0-65535

String pattern = "^([0-9]|[1-9]\\d|[1-9]\\d{2}|[1-9]\\d{3}|[1-5]\\d{4}|6[0-4]\\d{3}|65[0-4]\\d{2}|655[0-2]\\d|6553[0-5])$";

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexMatches {

public static void main(String args[]) {
String str = "";
String pattern = "^([0-9]|[1-9]\\d|[1-9]\\d{2}|[1-9]\\d{3}|[1-5]\\d{4}|6[0-4]\\d{3}|65[0-4]\\d{2}|655[0-2]\\d|6553[0-5])$";

Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(str);
System.out.println(m.matches());
}

}