title: How use match in ruby?
body: <p>Im trying to get the uppercase words from a text. How i can use .match() for this?
  Example</p>
  
  <pre><code>text = "Pediatric stroke (PS) is a relatively rare disease, having an estimated incidence of 2.5–13/100,000/year [1–4], but remains one of the most common causes of death in childhood, with a mortality rate of 0.6/100,000 dead/year [5, 6]"
  </code></pre>
  
  <p>and I need something like:</p>
  
  <pre><code>r = /[A-Z]/
  puts r.match(text)
  </code></pre>
  
  <p>I never used match and i need a method that gets all uppercase words (Acronym). </p>