Removing "www."; what (expression) replaces the scheme?

I’m attempting to come up with something to accept traffic on www. and redirect it the naked domain (so it’s clear it’s not used).

frontend port[80|443] from httpees
  ...
  http-request set-var(txn.txnhost) hdr(host)
  acl nowwwredir var(txn.txnhost) -m beg -i www.
  http-request redirect location http://%[req.hdr(Host),lower,regsub(www\.,,i)] code 30[1|2|3] if nowwwredir
  ...

…or:

frontend port[80|443] from httpees
  ...
  http-request set-var(txn.txnhost) hdr(host)
  http-request redirect location http://%[req.hdr(host),lower,regsub(www\.,,i)] code 30[1|2|3] if { var(txn.txnhost) -m beg -i www. }
  ...

I’m not completely sure if the unnamed ACL is correct. Anyway, while I have worked out everything to be as generic as possible and do have separate http://** and https:// frontends to infer the schemes, I’d like to replace the target scheme with an expression too, if possible. What would this be?

I’m open to different methods or other advise.

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