Question

How to modify this code to remove everything from a given string exept numbers (already there) AND strings: “.”, “k “, “B “, and “M “?

What Im doing is parsing prices given in: 123k, 124.7B, 20M

preg_replace("/\D/", "", "<td>Cost: 20b $, Sell for: 139k $</td>" );

Answer 1

This should do the trick (as defined in question):

preg_replace("/[^\.kBM0-9]/", "", "<td>Cost: 20b $, Sell for: 139k $</td>" );

I think a preg_match may be better, especially if there is more than one number in your string (as in your example):

preg_match_all("/([0-9]+(\.[0-9]+)?\s?[kBM]?)/", "<td>Cost: 20b $, Sell for: 139k $</td>", $match );

All numbers should then be nicely separated in the $match array.