How to select whole row in RegEx that begins with specific text followed by a number

I've got some regex that select a row that contains the text "Grand Total"

.*Grand Total .*

How would I go about selecting a row that specifically BEGINS with Grand Total, and is folowed directly by a number, eg "Grand Total 1,000.00".

I need this as there may be other lines in the text that begin with Grand Total but are not followed by a number

Any help there would be great.

Thanks!