counting the length of characters in a cell before a particular character.

I am trying to highlight cells that contain an X number of characters before the - sign. For e.g.. lets say I have a list like this:

12-2929
0993-2929
00992-2939
10-2929

From the above list I would like to highlight cells that contain 2 characters before the dash, i.e., 12-2929 and 10-2929. I was wondering, what would be the best way of doing this via conditional formatting or using the Len formula in combination with another formula?

Perhaps use as CF formula

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Highlight your range, conditional formatting, custom > enter =FIND("-",A1)=3