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<?php $re = '~(?<!\S)\S{11}(?!\S)~'; $str = 'Hello match this C90.083635. 11 character long word not C90.083635.73G because it exceed 11 character and not C90.08363 because is not 11 character long.'; preg_match_all($re, $str, $matches); print_r($matches[0]);
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31.31 ms | 405 KiB | 5 Q