Regular Expression to Validate URLs
Here is a short regexp that is used to validate whether a user has entered correct URL address. Might be useful in any scripts dealing with user data.
I will show it as PHP code:
preg_match(‘/^(http:\/\/|https:\/\/)([^\.\/]+\.)*([a-zA-Z0-9])([a-zA-Z0-9-]*)\.([a-zA-Z]{2,4})(\/.*)?$/i’, $_POST['url']);
It will check whether url suits the pattern. May not be ideal, but it’s working. 