o the end of the underlying sequence.
      </p>
<p>
        <span class="bold"><strong>Throws</strong></span>: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code>
        if the complexity of matching the expression against an N character string
        begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while matching
        the expression (if Boost.Regex is configured in recursive mod