Custom RegEx in Transform and compose section of event rule not working

[Ganeshm1]

Hi All,

I have configured custom RegEx to extract the required information in an event. 
Whenever I am trying to add the below RegEx expression in event rule, its asking two fields to select. 

Regex is working as expected in Regex101.com (Green color background is the one which I need as output)

In instance its asking two expression to select or add while i am using the custom regex. Can anyone help me how I can address this?

Regards,
Ganesh

[Fabian Kunzke]

Glad i could help, sometimes RegEx in ServiceNow is weird.