I tried using the Block Mapping to MAP the interface names directly (show interfaces Null0 output). Looks like there are some in-built parsers that are being invoked and hence if I select the interface "Null0" token as Variable, I am unable to create set a Name to the Token. The Value, Parser and Token Name has the value (multiple) on it.
I tried out an option to come up with the Custom Parsers and giving the Priority as -1 and still its not selecting the custome parser as the Parser type.
Can some one please help me with this.