Get Max Value from a list of scores within a single cell

I've tried searching online and on this forum and can't seem to find a formula that works

I have text within a single cell in the following format:

Score A [1]
Score B [2]
Score C [7]

It has multiple text lines within a cell with a number in square brackets. I want the cell next to this one to return the maximum score from that string of text.

Is there a formula that will work for this?

Here is an example sheet, scores are in cell E7 and I want to return the max in E8

forum example.xlsx