title: Matching a word followed by a space, followed by three numbers in BASH
body: <p>I have an issue that I would imagine is simple but I have spent the past hour trying everything out there.</p>
  
  <p>I'm trying to match a string followed by a space followed by 3 numbers in grep.</p>
  
  <pre><code>egrep hello\s\d{3}
  </code></pre>
  
  <p>I have also tried older styles:</p>
  
  <pre><code>grep hello[:blank:][0-9][0-9][0-9]
  </code></pre>
  
  <p>If I use grep with hello or the numbers in a row independently they work fine, but as soon as you try to combine it with a blank or a space, grep returns nothing.</p>