regex function needed

[pastet89]

Hi all!
I am looking for a function to delete all the parts of a string which are not:
1) numbers
2) the character " "
3) the character "-"

For example:
$string = " -2pp)*&^?>/>::hh 00-";
From that string I need just:
$final_string=" -2 00-";

I am not very good at regular expressions, but I know the can help in this case. Do you have any ideas...?😕

[nrg_alpha]

$string = " -2pp)*&^?>/>::hh 00-";
$string = preg_replace('#[^0-9 -]#', '', $string);

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