title: Regular Expression for all positive even numbers
body: <p>I am currently enrolled in Translation Applications and we are working on regular expressions. This IS a homework problem. I have been at this one for a while I am just confused. I don't want just an answer, an explanation would be greatly appreciated just making sure that I learn it.</p>
  
  <p>I just need a regular expression for all even numbers, leading 0's is okay.
  Here is some examples of what I need... (Examples,  0, 00, ... 2, 4, 6, 8, 10,  010, 12, ...)</p>
  
  <p>Thanks.</p>