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<?php $DATETIME_PATTERN = "^\\d\\d?.\\d\\d?.\\d{4} \\d\\d?:\\d\\d?:?\\d?\\d?$"; preg_match($DATETIME_PATTERN,'10.10.2017 11:11',$m); print_r($m);
Output for 7.1.6
Warning: preg_match(): No ending delimiter '^' found in /in/RSSSN on line 4