How do I locate the position of character in a string in Access?

I have a string in a field: "MS Steven, Middletown, Chicago, US"

How do I detect the position of last occuring ","? <--that one behind Chicago?
I know Instr function, but how do i detect in a reverse order?
hkgalAsked:
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Rey Obrero (Capricorn1)Connect With a Mentor Commented:

instrrev("MS Steven, Middletown, Chicago, US",",")
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Rey Obrero (Capricorn1)Commented:
you will use
instrrev(str,"?")
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hkgalAuthor Commented:
NICE
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