Count issues where text field contains values from a multi select list field

hi there
I have a multi select list field and we choose values , and we also have a field of text and it may have the values from the list , seperated by commas.
for example the list has A B C D E. the user selected A,B
the text might have A,B,D as text

now I want to write
(InStr([Measures].[Issue textfield],[Measures].[Issue listfield]) > 0 )))

so the question I have , is my syntax correct?