http redirect using iRule

Your iRule looks correct.

when HTTP_REQUEST { 
    if { [class match [string tolower [HTTP::uri]] starts_with Test-Redirect] } {
        pool [class match -value [string tolower [HTTP::uri]] starts_with Test-Redirect] 
    } else { 
        pool abc-pool 
    } 
}

** not sure if the space between "Test-" and "Redirect" was intentional, but there cannot be a space in the name. Otherwise, if it's as simple as a single URI check, you could probably skip the data group lookup.

when HTTP_REQUEST {
    if { [string tolower [HTTP::uri]] starts_with "/test" } {
        pool pqr-pool
    } else {
        pool abc-pool
    }
}

I'd also recommend applying a OneConnect profile here.