How can I yank two matches of regex group into two different registers?

Question

This answer teaches me how to yank matches of regex group into one register. But I want to yank two into two different registers. I've tried the following but failed.

:%s/\(regex1\)\(regex2\)/\=setreg('a', submatch(1))\=setreg('b', submatch(2))/n

An error thrown out says invalid expression. Then I modified it to be like this:

:%s/\(regex1\)\(regex2\)/\=setreg('a', submatch(1)) | \=setreg('b', submatch(2))/n

Then I get the error E493 backwards range given.

Can I do what I want? If so, how should I correct this snippet?

Answer 1

The idea is to give back a single (replace) result; so, concatenate works:

:%s/\(regex1\)\(regex2\)/\=setreg('a', submatch(1)) . setreg('b', submatch(2))/n