I have removed the second "\K". But this does not seem to help.

Here is what I intened to do

Lets say I have a string "RC1XY" which has 4 parts and when matched it would be as follows

Part 1 : RC => captured in P_ROOTCODE

Part 2 : 1 => captured in DAY1

Part 3 : X => captured in P_MON_CODE

Part 4 : Y => captured in P_NEW_MON_CODE

But if the string is passed as "RS" (instead of "RC1XY"), I was expecting P_ROOTCODE to hold "RS" and rest of the captures (DAY1, P_MON_CODE, P_NEW_MON_CODE) being blank. But even P_ROOTCODE is blank due to this undefined behavior

Can you please let me know if any other alternative approach to capture different parts when the string (ex :"RS" ) is not matching with the pattern.

Hope I made clear what is intened and hoping for solution or alternative approach

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