تالار گفتمان nCIS.ir

$arr = array('abc','5abcd','aan','ssedehi','assdd','asds','assd','asdd');

$words = array('a', 'aa', 'abc', 'baBba', 'sippa', 'cef');
foreach($words as $word) {
   if(preg_match('#(.)\1{1,}#', $word)) {
       echo '<p>' . $word . '</p>';
   }
}
/* Output:
aa
sippa
*/