JAVASCRIPT

Validate URLs

Implement a JavaScript function to validate URLs, checking for common protocols (http/https) and a valid domain structure.

function isValidURL(url) {
  const urlRegex = new RegExp(
    /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/
  );
  return urlRegex.test(url);
}

// Usage:
// console.log(isValidURL("https://www.example.com")); // true
// console.log(isValidURL("http://sub.domain.net/path?query=1")); // true
// console.log(isValidURL("example.com")); // true (optional http/https)
// console.log(isValidURL("invalid-url")); // false

How it works: This JavaScript function uses a regular expression to validate if a given string is a well-formed URL. It optionally matches `http://` or `https://`, followed by a domain name and an optional path. This regex provides a common level of validation for web addresses, suitable for many form inputs or link checks.

Validate URLs

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