title: Javascript/ jQuery and regex
body: <p>I"m building a registration form, and I need to validate the user's inputs. (username, email, password).</p>
  
  <p>I have regular expressions set up for each of these, and I can easily validate each in PHP using preg_match, and if it returns false, I can display an error.</p>
  
  <p>However, I think it'd be much nicer if the page did not have to refresh to display the error. Is there a javascript/ jQuery equivalent of preg_match?</p>
  
  <p>Thanks in advance for the help! I really appreciate it.</p>
  
  <p>(PS, I've seen the jQuery "validate" plugin, but I'd much prefer to do it myself)</p>