title: Extracting a certain part of string in Java using regex
body: <p>I need to extract a certain part of string in Java using regex.</p>
  
  <p>For example, I have a string <code>completei4e10</code>, and I need to extract the value that is between the <code>i</code> and <code>e</code> - in this case, the result would be <code>4</code>: <code>completei 4 e10</code>.</p>
  
  <p>How can I do this?</p>