$str = "2019-01-11 09:17:09,950 ERROR [ru.lanit.pgz.egrul.EgrulUpdater] (taskScheduler-2) Unexpected error during sending EGRUL data request to SMEV adapter: org.hibernate.exception.GenericJDBCException: Cannot open connection
        at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)";
$pattern = '/\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d*\s.*/m';
preg_match($pattern,$str,$arr);
print_r($arr[0]);