title: REGEX: Exact match a word followed by 1 space followed by digits
body: <p>I want to exact match a string followed by exactly one space and then numbers.
  I.e. input would be Acc 1234, should evaluate to true.</p>
  
  <p>Here is my regex that I've tried:</p>
  
  <pre><code>[^(\\WAcc\\W)[ ]{1}\\d]
  </code></pre>
  
  <p>This however fails for inputs (AccA1234 or Acc 1234 ACA, or Acc1234). How to I get my regex to match to my input (Acc 1234) exaclty?</p>