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Replace text in a string with a table field value

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Last Modified: 2015-03-12
I’m using an Access database. One of the tables contains a field that is a string expression. The string expression contains a reference to a field in another MASTER table in the database.
The Master table is joined by ID# with the table with the string expression (INNER JOIN MasteTable ON TableName.IDNUM = MasterTable.IDNUM

Example expression:
@M.PCNT @M.DOLLAR 0 % M$  
(PCNT & DOLLAR are fields in a MASTER table)
I would like to replace the reference with the actual value in the field it is referencing. When there is only one reference, I have designed a query and used:
EXPRESSION2: Replace([TableName]![EXPRESSION],"@M.PCNT",[MasterTable]![PCNT])
But, when there is more than one reference in the expression string, I have not found a syntax that will replace more than one reference.
I was thinking that a function that would check the case and make the appropriate replacement for the entire table instead of making separate querries would be nice, but I’m not sure of the syntax.
Like what I had in mind:
Case
Instr([TableName]![EXPRESSION]) = "@M.PCNT"
strReplace = [MasterTable]![PCNT]
Case
Instr([TableName]![EXPRESSION]) = "@M.DOLLAR"
strReplace = [MasterTable]![DOLLAR]
Have a case for every reference in the expression field.
Example expression:
@M.PCNT @M.DOLLAR 0 % M$
The Result would be like this
.02 500 0 % M$
if (@M.PCNT field value = .02) and (@M.DOLLAR field value = 500)
But the tables would have to be joined by ID#

Any help would be greatly appreciated!
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