title: How to remove space and restrict special chars using jquery?
body: <p>I am creating a signup form in my website. I want to implement some checkup with username, which are </p>
  
  <ul>
  <li>username can't have any space,</li>
  <li>username can't have any special characters other than dot (.) as gmail is doing in thier signup form.</li>
  </ul>
  
  <p>I am using jQUERY in my app, can anyone tell me how to implement above listed two checkups using jquery ?? I remember these two main checkups for username please suggest if you knows any other?</p>
  
  <p>Thanks</p>