I am tring to find a way to check for a string within a string but what I have came uo with is strill not working every time.

I am using the AT() function but this fails if my:

search expression is revJ
and searched expression is 855956-401 revJ2

J and J2 are two different revision levels.

Sometimes searched expression can be more complex like:
855965-401 revJ2, 855965-403 revJ2, 855965-405 revJ2

Any ideas?