MATCH formula with external lookup_array data

Hello,

I am trying to write a formula using the MATCH function =MATCH("x",r1:r10,0) to find the first instance of x in a column. However .... I need to be able to change the lookup_array data without altering the formula. For most formulas you can use INDIRECT or enter a reference to another cell to pull the data into the formula. The MATCH function does not evaluate references, and INDIRECT will not work because the reference is a range and not a single cell.

Any ideas of how to solve this?