Validate if domain name is correct using regex - Java XML

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Description

Validate if domain name is correct using regex

Demo Code

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//package com.java2s;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**
     * Domain Name Regular Expression Pattern.
     * <br>
     * Above pattern makes sure domain name matches the following criteria :
     * <ul>
     *      <li>The domain name should be a-z | A-Z | 0-9 and hyphen(-)</li>
     *      <li>Last tld must be at least two characters, and a maximum of 6 characters</li>
     *      <li>The domain name should not start or end with hyphen (-) (e.g. -google.com or google-.com)</li>
     *      <li>The domain name can be a subdomain (e.g. treeptik.corp.eu)</li>
     * </ul>
     */
    private static final String DOMAIN_NAME_PATTERN = "^([a-zA-Z0-9]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,6}$";

    /**
     * Validate if domain name is correct.
     *
     * @param domainName the domain name to check
     * @return {@code True} only if the domain name matches with the domain name pattern
     */
    public static boolean isValidDomainName(String domainName) {
        Pattern p = Pattern.compile(DOMAIN_NAME_PATTERN);
        Matcher m = p.matcher(domainName);
        return m.matches();
    }
}

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