unexpected
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<h1>to match</h1>
<p>Asserts a string matches a regular expression.</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello beautiful world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/bea.t.*/</span><span style="color: #000000">);</span></div>
</div><p>In case of a failing expectation you get the following output:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/beautiful/</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span> <span style="color: #df5000">'Hello world!'</span> <span style="color: red; font-weight: bold">to match</span> <span style="color: #183691">/beautiful/</span></div>
</div><p>This assertion can be negated using the <code>not</code> flag:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'not to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/beautiful/</span><span style="color: #000000">);</span></div>
</div><p>In case of a failing expectation you get the following output:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello beautiful world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'not to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/beautiful/</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span> <span style="color: #df5000">'Hello beautiful world!'</span> <span style="color: red; font-weight: bold">not to match</span> <span style="color: #183691">/beautiful/</span></div>
<div> </div>
<div>Hello <span style="background-color: red; color: white">beautiful</span> world!</div>
</div><p>The return value of <code>String.prototype.match</code> will be provided as the fulfillment
value of the returned promise, so the values captured by the regular expression
are available to the <code>then</code> function:</p>
<div class="code lang-javascript">
<div><span style="color: #a71d5d">return</span> <span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/(\w+)!/</span><span style="color: #000000">).</span><span style="color: #000000">then</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>captures<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>captures<span style="color: #000000">[</span><span style="color: #0086b3">0</span><span style="color: #000000">],</span> <span style="color: #df5000">'to equal'</span><span style="color: #000000">,</span> <span style="color: #df5000">'world!'</span><span style="color: #000000">);</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>captures<span style="color: #000000">[</span><span style="color: #0086b3">1</span><span style="color: #000000">],</span> <span style="color: #df5000">'to equal'</span><span style="color: #000000">,</span> <span style="color: #df5000">'world'</span><span style="color: #000000">);</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>captures<span style="color: #000000">.</span>index<span style="color: #000000">,</span> <span style="color: #df5000">'to equal'</span><span style="color: #000000">,</span> <span style="color: #0086b3">6</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">});</span></div>
</div><p>Or using the Bluebird-specific <code>.spread</code> extension:</p>
<div class="code lang-javascript">
<div><span style="color: #a71d5d">return</span> <span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #df5000">'Hello world!'</span><span style="color: #000000">,</span> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #183691">/(\w+)!/</span><span style="color: #000000">).</span><span style="color: #000000">spread</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>$<span style="color: #0086b3">0</span><span style="color: #000000">,</span> $<span style="color: #0086b3">1</span><span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>$<span style="color: #0086b3">0</span><span style="color: #000000">,</span> <span style="color: #df5000">'to equal'</span><span style="color: #000000">,</span> <span style="color: #df5000">'world!'</span><span style="color: #000000">);</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>$<span style="color: #0086b3">1</span><span style="color: #000000">,</span> <span style="color: #df5000">'to equal'</span><span style="color: #000000">,</span> <span style="color: #df5000">'world'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">});</span></div>
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