title: grep unicode 16 support
body: <p>I use TextEdit on macosx created two files, same contents with different encodings, then</p>
  
  <pre><code>grep xxx filename_UTF-16
  </code></pre>
  
  <p>nothing</p>
  
  <pre><code>grep xxx filename_UTF-8
  </code></pre>
  
  <p>xxxxxxx
  xxxxxxyyyyyy</p>
  
  <pre><code>grep did not support UTF-16?
  </code></pre>