title: JSON numbers Regular Expression
body: <p>I'm trying to write a regular expression for strings that are numbers in JSON. I'm still new to writing Regular expressions, I found a diagram of a machine for JSON numbers <a href="http://www.json.org/"> here </a>, but I'm not sure how to attack it.</p>
  
  <p>Here are some strings that should be found by the regex.
   "22", 
  "55.75466",
  "-44.565"
  "55e-2"
  "69234.2423432 E78"
  Any help is appreciated!</p>