string parsing in between curly bracket

[eluser]Reynolds[/eluser]
Hi guys,

can you tell me how do this?

Code:

<?php
$str = "hello{key:value}world";
// from this string, I would like to find and replace the {key:value}, let's say for example:

$str_2 = "The item {item_name:123} costs {item_amount:123}."; // item_id = 123

will give a result of

$str_2 = "The item Samsung Galaxy S costs $999.";