title: How to grep for a 7 digit hexadecimal string and return only that hexadecimal string?
body: <p>I am trying to extract all the leading 7 digit hexadecimal strings in a file, that contains lines such as:</p>
  
  <pre><code>3fce110:: ..\Utilities\c\misc.c(431): YESFREED (120 bytes) Misc
  </code></pre>