Java 正则表达式 判断IPv4正确性

[java]代码库

private boolean IPisCorrect(String ip)
{//正则表达式判断IP正确性
//import java.util.regex.*; 
Pattern p=Pattern.compile("^(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])$");
Matcher m = p.matcher(ip);
boolean b = m.matches();

return b;
}