Text Filter - Custom Visual - Doesn't do exact text match

[LD2022]

Below is the requirement:

1. Slicer to search Account # (Slicer shouldn't show the list of Account # to select) and user can copy and paste the Account # and hit enter to search and view report results

2. Length of Account # could vary from 6-12 

Current State:

1. Text filter visual used in the report however it uses "contains" instead of "in"/"equals" and doesn't perform an exact match based on the input. e.g.

Slicer value = A1 returns results like

 AA1

A1

BA1 etc..

It should return A1 only.

2. I tried to use SELECTEDVALUE ,CONCATENATEX to get the list of values by length in ascending order where COUNTROWS (Slicer[Account])>1 and fetch the 1st value from the delimited text but it doesn't seem to work for all scenarios.

The 2nd option is to customise the Text Filter custom visual.

It would be greatly appreciated if I can get some guidance around the above options.