write using exact match.

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write('test', 'Address') writes 'test' in a field labelled 'Address Line 2'
I'm trying to write only if there's an EXACT match. i.e. write 'test' if 'Address' field exists. If it doesn't, don't write anything. 'Address' is not the same like 'Address Line 2'.

Is there a way that can be done? Thanks so much!