nal-link">stats::lm()</a></p></dd>


<dt>at_start</dt>
<dd><p>Logical indicating whether or not to include <code>^</code> in the regular expression to begin search at start of string</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>A character string for use as a regular expression.</p>
    </div>
    <div class="section level2">
    <h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author">