Here's what I would do:
Create a text parameter called "Ends With" and use that in an input box control.
Create a calculated field called "Matches" that looks something like this (where TextField is the field you want to match on Ends With):
IF(RIGHT_TEXT(TextField, LENGTH(Ends With))=Ends With, TextField, null)
If you use the Matches field in a table, it will return only the TextField values that end with your Ends With entry. (You can put a filter on the table to exclude the null record.)
Here's my quick example.
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