n class="special">&amp;</span> Test<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.3.9.16.5.4"></a><h2>Description</h2>
<p>This predicate holds when the test string is a prefix of the Input. In other words, if the input starts with the test. When the optional predicate is specified, it is used for character-wise comparison.</p>
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