Parse text file in shell & store to variable

Hi,

I need to parse a simple text file like below and store the word that starts with BR* to a variable say $BRno. I need to do this in sh script.

NOTE: the length of the numbers following BR is in constant. And there is only 1 BRXXX in a file at a given time.

.txt file:

BR276828
Apple
Orange
CHERRY
test.txt

Gurus, Please help as soon as you can !

Thanks !

Homework? I think so. Thread closed.