title: Regex for strings that contain only odd clusters of b's with set {a,b}
body: <p>This must be valid</p>
  
  <pre><code>ababbba
  </code></pre>
  
  <p>This must be invalid</p>
  
  <pre><code>bb
  </code></pre>
  
  <p>I only know that this regex ensures odd b's per iteration</p>
  
  <pre><code>b(bb)*
  </code></pre>
  
  <p>However my current regex fails when repeated.</p>
  
  <pre><code>(a*b(bb)*)*
  </code></pre>