Java - Extract FIRST number from a Textview

I just can't figure out how to extract first number from a Textview.

My Textview is

"Maximum week limit of this debit card is 300 000 CZK. Limit can be still increased up to 265 944 CZK".

What I need is to extract 300 000 number from this object.

I can find the ID of this Textview easily and work with it. Can please someone help me? Thanks.