How get 4 characters from a string of characters

If I have this string of characters in a text field on a form...  "80522526J142-101"    How can I "pull" the "J142" portion of it out for use in another text field on a form?  It will always be the 4 characters prior to the hyphen.
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pls try

res: Mid("yourString",Instr(1,"yourString", "-")-5,Instr(1,"yourString", "-")-1)

Russ SuterSenior Software DeveloperCommented:
You could do this with a simple Regex. The following will match the 4 characters immediately preceeding a '-' character.

var testString = '80522526J142-101';


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Corrected Code

res: Mid("yourString",Instr(1,"yourString", "-")-5,4)
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SteveL13Author Commented:
This didn't work:  Mid("yourString",Instr(1,"yourString", "-")-5,Instr(1,"yourString", "-")-1)


what is Regex?
Russ SuterSenior Software DeveloperCommented:
Sorry, slight edit to above...
var testString = '80522526J142-101';


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This is just in case your string contains more than 1 '-' character. If you need to respond to multiple matches then the logic gets a little more complex.
SteveL13Author Commented:
Actually I'm trying to do it in a query.  Like:

Query snapshot
But when I try to run the query I get "Invalid procedure call".

pls try
Code: Mid( [PartN],Instr(1, [PartN], "-")-5,4)

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SteveL13Author Commented:
Had to modify slightly:

Code: Mid([PartN],InStr(1,[PartN],"-")-4,4)
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