Add email verification to the hire_me_contact_form.

https://www.pivotaltracker.com/s/projects/982890/stories/72996772

I made email verification for the hire_me_contact_form. My question is where can I find contact us form as @yggie mentioned in the ticket? I found just a mailto link.
Other question:
Where can I put the regular expression constant? Maybe we need to put somewhere that other methods can use it. I didn't find any place where this values store the page.