How do i remove http://www in form?

How do i remove http://www in form?

I want to remove

https://www<br>
http://www <br>
https://<br>
http://<br>
in form like this:
<form class="well" action="process.php">
<input type="text" name="q" placeholder="{$lang.placeholder}"
x-webkit-speech>
<select name="t">
<option value="domain">{$lang.domain}</option>
<option value="ip">{$lang.ip}</option>
<option value="nameserver">{$lang.nameserver}</option>
</select>
<button type="submit" class="btn"><i class="icon"></i>
{$lang.button}</button>
do you guys have a tip!?