Extract data with regex php

My string :

a:3:{i:0;s:9:"John";i:1;s:9:"Doe";i:2;s:22:"Smith";}

I want to extract John, Doe, Smith

>Solution :

If it’s an original string that was serialized from an object, you can try to unserialize it

$data = 'a:3:{i:0;s:4:"John";i:1;s:3:"Doe";i:2;s:5:"Smith";}';
print_r(unserialize($data));