title: Limit the Length of a Hexadecimal Escape Sequence in a C-String
body: <p>In a string literal, how can I follow a hexadecimal escape sequence immediately with a literal character that can be interpreted as a hexadecimal digit?  For example, if I write this literal ...</p>
  
  <pre><code>"BlahBlah\x04BlahBlah"
  </code></pre>
  
  <p>... the <code>'B'</code> immediately following the <code>'4'</code> will be interpreted as part of the hexadecimal escape, because it is a valid hexadecimal digit.  </p>
  
  <blockquote>
    <p>How can I write a string literal that represents the string that the above would represent if the <code>'4'</code> were taken as the last character of the hex escape?</p>
  </blockquote>