Irule issue for if statement error

It's likely caused by the way the rule is flattened. When I create a rule as follows on 11.5.3, it works fine:

when HTTP_REQUEST { 
    if { ([HTTP::uri] contains "/dfg") and !([matchclass [IP::remote_addr] equals IP_Range]) } { 
        HTTP::redirect "https://abc.com" 
    }
    
    pool ab-Pool
}

Newlines (and semi-colons) are statement delimiters in Tcl, and somewhat counter-intuitively,

if

is a command in Tcl, as is

pool

. Therefore, the

if { ... } { ... }

is one statements, and the

pool ...

in another.

Having said that, note that

matchclass

is deprecated, as explained here:

• matchclass

You should use

class match

, instead.

Moreover, the

pool

command at the end is essentially a noop if you assigned that pool to the associated Virtual Server. Assuming this is the only iRule associated with the VS, you should remove the

pool

command, and if you've not done so already, assign the pool to the VS. It is clearer and more performant.