Introduction

In Java, URL validation is commonly required in web applications and data processing. The java.util.regex package in Java provides the functionality for regex-based URL validation.

URL Regex

Java regex for URL validation typically includes the protocol, domain, and optional path.

The URL Regex Pattern

• Pattern: https?://(?:www\\.)?[a-zA-Z0-9./]+

• This regex pattern supports HTTP and HTTPS and optional 'www.'.

How to Validate URLs in Java?

To perform URL validation in Java:

import java.util.regex.*;

public class URLValidator {
    public static boolean isValidURL(String url) {
        String regex = "https?://(?:www\\.)?[a-zA-Z0-9./]+";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(url);
        return matcher.matches();
    }

    public static void main(String[] args) {
        String url = "https://www.example.com";
        System.out.println("Is URL valid? " + isValidURL(url));
    }
}

Uses of URL Regex Validation

1. Web Applications: Validating URLs in user input, such as form submissions or URL parameters.

2. Data Validation: Ensuring the correctness of URLs in datasets, crucial for data integrity.

What next?

Java's robust regex capabilities facilitate effective URL validation, ensuring correctness in web applications and data processing. For comprehensive validation, including advanced URL formats, Akto's regex validator is a valuable resource.