it's not a wildcard it notates the beginning/end of a date field.
what do you want your result to be?
Two separate fields one for the quantity, one for the measure
i.e.
Code:
ItemWeight ItemUnit
1 Pounds
2 Ounces
10 Grams
if you don't care about the unit measure or just want to replace it with a string (which I don't recommend)
you could run an update query on the current field that and in the UPDATE TO row of the query put something like Replace([Fieldname], "#", "lbs")
if you want to split the units and the actual value that would also be a update query but you'd have to split the field using something like
left([fieldname], instr([fieldname], "#") -1)
and
right([fieldname], len([fieldname]) - instr([fieldname],"#"))