preg_split unexpected behavior

Question

I use preg_split as the following:

I ex

Answer 1

You have to add delimiters to your regex like this:

Output:

Array ( [0] => 99 [1] => 14 )

EDIT:

The question why OP got the entire string back in the array is simple! If you read the manual here: http://php.net/manual/en/function.preg-split.php

And take a quick quote from there under notes:

Tip If matching fails, an array with a single element containing the input string will be returned.