title: Regular expression to match string starting with a specific word
body: <p>How do I create a regular expression to match a word at the beginning of a string?</p>
  <p>We are looking to match <em>stop</em> at the beginning of a string and anything can follow it.</p>
  <p>For example, the expression should match:</p>
  <pre class="lang-none prettyprint-override"><code>stop
  stop random
  stopping
  </code></pre>