fix(validation): improve URL validation to handle edge cases

[usernane]

Problem

Current isValidURL regex may not handle:

• localhost
• localhost:3000
• IPv6 addresses
• URLs with authentication (user:pass@host)
• Data URLs

Current Implementation

var pattern = new RegExp('^(https?:\\/\\/)?' +
  '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|' +
  '((\\d{1,3}\\.){3}\\d{1,3}))' +
  '(\\:\\d+)?(\\/[-a-z\\d%_.=~+!]*)*' +
  '(\\?[;&a-z\\d%_.~+=/-]*)?' +
  '(\\#[-a-z\\d_]*)?$', 'i');

Suggested Fix

Use the URL constructor for validation:

isValidURL: {
  value: function (url) {
    try {
      new URL(url);
      return true;
    } catch {
      return false;
    }
  }
}

Test Cases That Should Pass

• http://localhost
• http://localhost:3000/api
• http://[::1]:8080
• https://example.com