title: MySQL REGEXP repeating characters
body: <p>How can I find strings with individual repeating characters (for example 3 times)?</p>
  
  <p>This works but I don't want rewrite every alpha characters (a,b,c,d,e...):</p>
  
  <p>... REGEXP '(a){3}|(b){3}|(c){3}|(d){3}|(e){3}|(f){3}...' ...</p>
  
  <p>Thank you very much</p>