Restricting a field to certain characters only

When our users place a advert they are allowed to fill a url in the form

Trying to restrict the characters to only allow

http://www.domain.com

rather than

mailto: or @hotmail.com

using a program called Reg Creator from Program 1

reg expression I am trying is

mailto and @
(\w+)\s+(@\s+)

and

/(\w+)\s+(@\s+)/

I think I am missing what I need to do to restrict mailto and allow http://

Anyone assist me in the right direction please?

 

Try this


^s?https?:\/\/[-_.!~*'()a-zA-Z0-9;\/?:\@&=+\$,%#]+$

Regards

Alex