PHP code - 21 lines

Link:

PHP, pasted on Jul 30:

<?php

$string = "
0001

a
b
c
d
e

0002

f
g
h
i
j
";

print_r(preg_split("/(?=\d{4})/", $string));

Output:

Array
(
    [0] => 

    [1] => 0001

a
b
c
d
e


    [2] => 0002

f
g
h
i
j

)