title: regex: alternating character / sequential numeric
body: <p>I am looking for regular expression in java that matches the following pattern:</p>
  
  <ol>
  <li><p>two alternating numeric or alpha values  Example: 12121212 or adadadad</p></li>
  <li><p>numeric or alpha sequences with at least 4 sequential digits Example: cdefgh or 123456</p></li>
  </ol>
  
  <p>thanks</p>