title: Is this selection by Regex Coach is incorrect?
body: <p><code>[^a]</code> is as interpreted as follows:</p>
  
  <p><a href="https://i.stack.imgur.com/fAi93.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fAi93.png" alt="enter image description here"></a><br>
  You can see it's selecting only first character which is not <code>a</code>. 
  But <a href="http://regexr.com/" rel="nofollow noreferrer">regexr.com</a> selects this differently as shown in following screen shot.</p>
  
  <p><a href="https://i.stack.imgur.com/cgfa7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cgfa7.png" alt="enter image description here"></a></p>
  
  <p><a href="http://regexr.com/" rel="nofollow noreferrer">Regexr.com</a> makes sure that <code>[^a]</code> matches every character which is not <code>a</code>.
  So which one of these is erroneous? </p>