title: Why isn't my range regex syntax working?
body: <p>I'm using Ruby 2.4.  I want to say match a string that contains between 3 and 4 consecutive numbers.  But my braces syntax isn't working</p>
  
  <pre><code>2.4.0 :034 &gt; data = "1234"
   =&gt; "1234"
  2.4.0 :035 &gt; data =~ /\d{3, 4}/
   =&gt; nil
  </code></pre>
  
  <p>What's the ocrrect way to say this?</p>