Include Txt to a certain character in a string

I have the following EDI message and have the following statement in a query;  

Units: Mid([swift],InStr(1,[swift],":36B::SETT//UNIT/")+17,12)

In this particular line, the number of characters is variable until the ','.  So what I need to do is bring in 3493 in this case but if it was 99999, then I would need to bring in 99999 and so forth.  It is whatever value from the / to the ,.

The above code is bring in characters from the next line.   How do you stop at the ','?

I was trying the charindex function but without much luck.  Any ideas?

:35B:ISIN NO0010985
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Do you always look for the FIRST instance of the comma, and the get all characters BEFORE that comma up to the preceding slash?

If so, you can do this:

Units: mid([swift],Instrrev([swift],"/",instr([swift], ","))+1,   instr([swift], ",")- Instrrev( [swift],"/",instr([swift], ","))-1)


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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
BTW, I'm assuming that [swift] if the field that contains your data above.
mtrussellAuthor Commented:
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