title: Laravel form text field validate for specific url?
body: <p>I am building some user profiles and want to add social links to the profiles so users can link to their, let's say Steam, YouTube, Google+ profiles.</p>
  
  <p>So i can't find any way of validating against specific url's in laravel. I want a user, if he set a link in steam text field to validate if given url is really url to steampowered.com, or if not to throw an error that url is not valid.</p>
  
  <p>I have read the documentation on validation and i read that there is a URL validation, but as i have read it's only validating agains the input if it's formated as an url. so basically user can post any url and it will be validated.</p>
  
  <p>Is there a filter or some additional condition to URL validation for a specific url. So the input field will be valid only if user insert like: <a href="http://steamcommunity.com" rel="nofollow">http://steamcommunity.com</a> in the field.</p>
  
  <p>How can someone achieve that, or i must write old php regex expression?</p>