In the most web sites when you want to register in any web sites, you must provide your information such as First name, last name, email and etc. Then the web site create a confirm link and send it to your mail. If you input your mail correctly, you can check it in your inbox of your mail and click on it to your registration is completed.
In this scenario, the users should input their mails correctly because the web sites will send the confirm link to it. In other words the mail that the users input must be owned of user else if they can't click on the confirm link.
Suppose you want the users input their web sites instead of their emails address in your web site, Now How can you check the user is owned of the web site that is input in the textbox?
I hope you understand my question else if tell me to describe it more.
With Regards. Mojtaba
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