t. The input sequence and the format string
            specifier passed to the algorithm, can be encoded independently (for
            example one can be UTF-8, the other in UTF-16), but the result string
            / output iterator argument must use the same character encoding as the
            text being searched.
          </p>
<p>
            Example: Credit card number reformatting:
          </p>
<pre class="programlisting"><span class="comment">//</span>
<span class="comment">// Take a credit ca