Is there an Expression that will test for specific text ?

Hello, I am trying to add a condition in our log report, in the USCS Symbol column, not to print out the data there if the Sediment Type field at the same depth contains the text "Similar to above".   I tried the following:
<<IIf(<<STRATIGRAPHY.Sediment Type>> = "Similar to above" OR "Similar to above, except",,<<STRATIGRAPHY.USCS_Symbol>>_
)>>
That results in the USCS Symbol not appearing at all, anywhere.
Any ideas?  Thank you!