span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput"><span class="identifier">fmt</span></code>
        is either a null-terminated string, or a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s,
        then copies the character sequence <co