Extracting fields

[MicMoo]

I have the following log

2021-08-03T14:12:40,872 th=foo cl=bla p=INFO {"tag":"bla","goo":"SPA","msg":{"dir":"in","correlation":"2035456876870723587526","pack":"ebcdic","0":"1234","3":"001234","4":"000000001234","6":"000000001234","7":"0803141240","11":"521464","41":"51400055","47":"ERT0001234000\\ARDABABDGDG\\GRE1234\\VTE01123400824\\GDE00\\SSER\\Ort612348\\Ort072\\rtI0\\","49":"124","61":"12340000004"}}

I would like to extract the two fields in RED and Pink and rename field to Co

The fields in BOLD GREEN will be key and must be present, rest might or might not.

This is what I got so far 

index=bla  | rex \"47\":\"*ARD(?<CODA>.{4})

however this is not working and filed is not getting populated. 

Thank you

[MicMoo]

Thank you @venkatasri , nearly there , when I use what you suggested nothing is extracted , however if I remove the "ARD" string ,  red and pink where populated but not all cases with the correct info 

[venkatasri]

Can you share the samples that's not working.

[MicMoo · Accepted solution]

Solved, should have simplified my search 

\\\\ARD(?<RED>\w{4})(?<PINK>\w{4})

[venkatasri]

@MicMoo Can you try this?

<your_search> 
| rex "47\".+?\\\\ARD(?<red>\w{4})(?<pink>\w{4})"