Validating IPv4 string in Java
- by Mat Banik
Bellow method is validating if string is correct IPv4 address it returns true if it is valid. Any improvements in regex and elegance would be very appreciated:
public static boolean validIP(String ip) {
if (ip == null || ip.isEmpty()) return false;
ip = ip.trim();
if ((ip.length() < 8) & (ip.length() > 15)) return false;
try {
Pattern pattern = Pattern.compile("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
Matcher matcher = pattern.matcher(ip);
return matcher.matches();
} catch (PatternSyntaxException ex) {
return false;
}
}
