IRULE to redirect traffic from URL to another URL except for specific URI

You can try below irule. which will help to achieve your requirements.

when HTTP_REQUEST {
	if { ([string tolower[HTTP::host]] equals "abc.com") and ([HTTP::uri] starts_with "/xyz") } {
		HTTP::redirect "https://[HTTP::host][HTTP::uri]"
	}
	elseif {[string tolower[HTTP::host]] equals "abc.com")} {
	HTTP::redirect "https://bbc.com" 
		}
} 

Let us know if any issue.