n> flags <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span></pre>
<p>Builds a <code class="computeroutput"><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a></code> object from a range of characters.</p>
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