How to filter a wording

Hi,

Have any function can I filter a wording in a program script?

Example: I have formula like this "Width*L(125 * (W + Length)) + 3125AC + (125 * ((Wdth + L) - 125))"

How can i get it to be W*L(125 * (W + L)) + 3125 + (125 * ((W + L) - 125))?

Please advise. Thanks.