Prepend to path conditionally

I am trying to conditionally prepend a subdomain to the path.

Incoming https://<subdomain>.mysite.com/<path>

This should become https://<subdomain>.mysite.com/<subdomain>/<path>

but only if the path does not already start with . For example:

https://abc.mysite.com/jungle should become https://abc.mysite.com/abc/jungle

but https://abc.mysite.com/abc/jungle should not be changed.

I have this in haproxy.cfg. It correctly isolates the subdomain in var(req.store_id) but it prepends to the path enve if the store_id

    acl insti_prod         hdr_reg(host) -i [^.]*.mysite.com

    http-request set-var(req.store_id) req.hdr(host),lower,regsub(\.mysite\.com$,) if insti_prod

    # Pre-pend subdomain to the path if not already there
    http-request set-path /%[var(req.store_id)]%[path] if { var(req.store_id) -m found } !{ path_beg /var(req.store_id) }

Where am I going wrong??

Thanks!

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