Variable for part of infoobject text

Hi Experts,

I need to create a variable (manual input) in one of my reports where the user wants to restrict the query to parts of the text of an infoobject.

An example of what I am trying to achive here

Item Item description (text of infoobject item)

123456 Buyed BFOU9940

456789 Buyed RFOU 0,6

789191 Produced BFOU 89,33

111213 Produced RFOU 77

The user wants to enter i.e. BFOU which restricts the query to item 123456 and 789191.

How can achieve this in BEX?

Help will be appreciated.