title: Regex explanation - how does it work?
body: <p>I came across on "REGEX" but I not really understand those symbol use by it. example... and many more</p>
  
  <pre><code>rege = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  </code></pre>
  
  <p>I use above to do email verification and it work, but as I say I'm not fully understand how it work! Does anyone of you have simple tutorial or website that explain about it?</p>
  
  <p>Because I going to write for myself for Float verification.</p>
  
  <p>Which accept 0-9 (numbers only) with decimal character (.) and length = 5.</p>
  
  <p>example: 99.9</p>