Redirect many domains

You can use switch statement to perform the redirects.

OR

You can utilize data group and class match statements.

See if this link helps.

Are you sure about this, redirecting to itself?

also redirect (a.com/z/v/p to a.com/z/v/p)

when HTTP_REQUEST {
    switch -- [string tolower [HTTP::host]] {
        "www.x.com" {
            HTTP::redirect "https://www.x.com/a/b/c/"
        }
        "www.y.com" {
            HTTP::redirect "https://www.y.com/w/d/r/"
        }
        "a.com" {
            if { [HTTP::uri] starts_with "/z/v/p" } {
                HTTP::redirect "https://domain.com/z/v/p"
            } elseif { [HTTP::uri] starts_with "/z/v" } {
                HTTP::redirect "https://a.com/"
            }
        }
    }
}

Why not using policies. These are available starting 11.4 and are more efficient than iRule in this case. see here for details:

https://support.f5.com/kb/en-us/solutions/public/15000/000/sol15085.html