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<?php var_dump(preg_match('/^[a-z0-9-]/i', 'Something.doc')); var_dump(preg_match('/^[a-z0-9-]*/i', 'Something.doc')); var_dump(preg_match('/^[a-z0-9-]*$/i', 'Something.doc')); var_dump(preg_match('/^[a-z0-9-.]*$/i', 'Something.doc'));
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
int(1) int(1) int(0) int(1)
preferences:
163.1 ms | 404 KiB | 188 Q