ip地址的正则表达式

"((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)\\.){3}((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)){1}";

/**
 * Created by baiwenlong on 11/26/15.
 */
public class IpUtils {

    private static final String sIpPatternStr = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)\\.){3}((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)){1}";
    private static Pattern sIpPattern = Pattern.compile(sIpPatternStr);//ip的正则表达式

    /**
     * 判断url的domain是否为ip地址(http:255.255.255.255/xxxx/a?a=a
     * @param url
     * @return
     */
    public static boolean isWithIpDomain(String url) {
        if (url == null) {
            return false;
        }
        try {
            String domain = new URL(url).getHost();
            return isIp(domain);
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        }
    }

    /**
     * 是否是ip地址(255.255.255.255)
     * @param ipStr
     * @return
     */
    public static boolean isIp(String ipStr) {
        if (ipStr == null) {
            return false;
        }
        return sIpPattern.matcher(ipStr).matches();
    }