title: Regular expression that accepts strings where every two zeros are followed by a one
body: <p>so i'm looking for a way to write a regex that accepts all strings, but in any string that contains two consecutive zeros a 1 must follow immediately
  for ex. it will accept</p>
  
  <pre><code>0
  10
  01
  0010
  1111
  11001001
  </code></pre>
  
  <p>but not</p>
  
  <pre><code>00
  000
  100
  </code></pre>