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@ 2020-04-14T19:08:15Z

<?php
$str = 'AB?????DE';
if (preg_match('/(.)\\1{3}/', $str, $matches))
   print_r($matches);

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

24.96 ms | 405 KiB | 5 Q