java - Regex to match string of unique characters -

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This is my regular expression: 

  ((AZ)) + )

I want every letter to be displayed most often, unfortunately it is not working properly, because this input: 

 < Code> Go ABCC  
 
 
 
 
 
 
 
  ^ (GO: ([AZ]) (?!. * * 2)) + $$

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