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<?php $string = 'aaaaabbbcccccccccdddee'; var_export(preg_match_all('/(?:(.)\1{3,}(*SKIP)(*F)|(.)\2{2})/', $string, $m) ? $m[0] : 'no matches');
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'bbb', 1 => 'ddd', )

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