VSCode regex find & replace submatch math?

Question

%s@{fileID: \\(213[0-9]*\\)@\\=\'{fileID: \'.(submatch(1)-1900)@

I am using this regex search and replace command in vim to subtract a constant fro

Answer 1

Given a regular expression of (foobar) you can reference the first group using $1 and so on if you have more groups in the replace input field.