Count if - not exact match - from cell not string

Hi there,
I have a formula, here is an example -
=COUNTIF('Workbook2.xls]Sheet1'!A1:AH3000, B3)

This works fine, but I would like to find any match, rather than an exact match.

From my research, I have found an answer if I was using text, by putting stars around it.
i.e. =COUNTIF('Workbook2.xls]Sheet1'!A1:AH3000, "*example*")

However, I can't seem to find a similar solution for using a cell entry, i.e. the result of B3
Is this possible?

Many thanks Simon

awesome thanks.