Take numeric value from a text object and compare to another value

I want to collect the value after BDT and check it to another value. I was trying but there is a problem. Could you please help me to solve this problem?

Text object :
Wallet balance is BDT 1489.93 as of 8/12/2018 1:51:24 PM
I was trying with the below one regex to verify first:

Thanks in advance