regexp preprocessing with conditional return value

[trta]

I can get these values from item:

OK LOGIN Completed

or

NO LOGIN Error message

I would like to regexp that by something like

.*(OK|NO) LOGIN(.*)

and want to get

if ok return value \1, if NO then return value \2 (that Error mesage)

At now, I can get "OK" or "NO" easilly but I don't know how to create something like "if"

How can I make it please?

[cyber]

JS preprocessing, I think... regular regex will not do it for you...

[Hamardaban]

In preprocessing:
step 1) "Matches regular expression" compare with "^NO LOGIN.*". Check the option "Custom on fail" and output the value "OK".
step 2) "Regular expression" "^NO LOGIN(.*)"- output the first group \1.

[cyber]

Right... 2 steps... stupid me...