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<?php function matchIndetifier($str) { if ($str != preg_replace("/[^0-9a-z]/i", "", $str)) { //Invalid contains characters other than a-zA-Z0-9. } if (isnumeric($str)) { //999999 } if ($str != preg_replace("/\d/", "", $str)) { //At this part, it's not numeric, but still has numbers. Invalid. } if (ucfirst($str) == $str) { //Ullllll } if (strtolower($str) == $str) { //llllll } if (strtoupper($str) == $str) { //UUUUUU } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4

preferences:
322.09 ms | 405 KiB | 456 Q