title: Regex - Strings with Odd/Even characters
body: <p>on my homework assignment I have an alphabet a, b, and c.</p>
  
  <p>I have two questions that I cannot figure out.</p>
  
  <p>1) strings with an odd amount of characters.</p>
  
  <p>2) strings with an even amount of characters.</p>
  
  <p>How can I track even/odd strings in regex? Any help is appreciated.</p>