Get the rest of the string after a certain character

This is how to extract a sub string within a string by getting all after a certain character, in this case "\\".

<?php
$string
= "[SQL Server Job System:] 'MPlan.Full Backup' completed on \\SERVER34";

//after \\
preg_match("/^.+?\\\(.+)$/is" , $string, $out);
//result: array  0 => [SQL Server Job System:] 'MPlan.Full Backup' completed on \\SERVER34
//                     1 => SERVER34


//after ]
preg_match("/^.+?\](.+)$/is" , $string, $out);
//result: array  0 => [SQL Server Job System:] 'MPlan.Full Backup' completed on \\SERVER34
//                     1 =>  'MPlan.Full Backup' completed on \\SERVER34

?>