title: Regex for detecting repeating symbols
body: <p>I'm looking for the regex expression that will detect repeating symbols in a String. And currently I didn't found solution that fits all my requirements.</p>
  
  <p>Requirements are pretty simple:</p>
  
  <ul>
  <li>detect <strong>any</strong> repeating symbol in a String;</li>
  <li>to be able to <strong>setup repeating count</strong> (eg. more than twice)</li>
  </ul>
  
  <p>Examples of required detection (of symbol 'a', more than 2 times, true if detects, false otherwise)</p>
  
  <p>"Abcdefg" - <em>false</em></p>
  
  <p>"AbcdaBCD" - <em>false</em></p>
  
  <p>"abcd_ab_ab" - <em>true</em> (symbol 'a' used three times)</p>
  
  <p>"aabbaabb" - <em>true</em> (symbols 'a' used four times)</p>
  
  <p>Since I'm not a pro in regex and usage of them - <strong>code snippet</strong> and <strong>explanation</strong> would be appreciated!</p>
  
  <p>Thanks!</p>