title: grep with alphabet
body: <p>I want to look for all the lines in my file <code>file.txt</code> which contains the pattern <code>phone/number/</code> followed by a lowercase alphabet (a-z). I know that for just <code>phone/number/</code>, I can use </p>
  
  <pre><code>grep "phone/number/" file.txt
  </code></pre>
  
  <p>But what about the alphabet following it?</p>