Extract multiple occurrences of text between given strings in Google sheet

My input text, in a single cell, is the result of user choice selection. It is similar to (so its a string with multiple substrings):

"meal (20$)", "metro (5,5$)"

I would like to extract (to then sum) the prices of each individual choice, to have this sum result in another cell:

20+5,5

I have been searching around with the FIND and SPLIT function but I only succeeded to extract the first price with it. Another solution I see would be to split the text and use an ArrayFormula for the summation, but for now I do not find how to split with multiple characters.

I am using Google sheet, so I cannot use the TEXTSPLIT Excel function, and no macros.

So in a nutshell:

Note the comma, because my local is France.

Thank you for your help!