extracting characters from string

[Spud_Nic]

i'm sure this has been asked before, but I can't find anything on the search so maybe not!

I have a string such as

$stringname = "455/54+345*43";

And I want to extract all the groups of numbers and operators into seperate variables so the output would be:

$num1 = 455
$num2 = /
$num3 = 54
$num4 = +

etc etc

and once I have them into this form I will want to perform the math functions it has in the string so the sum is calculated.

I'm thinking I need to use Substr, and then explode to an array?
Any pointers you can give me?
cheers

[jnuneznyc]

Here is a start... I don't know RegEx that much so here is a line that will help convert it to and array.

([0-9])[ ]?([/\+-].)[ ]?([0-9])[ ]?([/\+-].)[ ]?([0-9])[ ]?([/\+-].)[ ]?([0-9]*)

Use the preg_ commands with the above string to break up your formula: 455/54+345*43