how to use field value present in one rex into another rex

[Chandrasekhar6]

index=cs |  rex "Type=(?<type>[a-z]+)"
| rex field=AResponse.BResponse.Message mode=sed "s/Ref number+\w+\sfailed on num:*+/NetworkA failed on num: /g"

Here I hardcoded NetworkA  in second rex
but actually its a dynamic value and it should be changed according to value present in field type

How to use type value in second rex 

[justinatpnnl · Accepted solution]

It seems like you may be able to accomplish what you want with an eval:

index=cs 
| rex "Type=(?<type>[a-z]+)"
| eval AResponse.BResponse.Message = replace('AResponse.BResponse.Message', "Ref number \w+ failed on num: ", type." failed on num: ")

[Chandrasekhar6]

Tq so much 

[richgalloway]

Try using the concatenation operator to include the field from the first regex in the second.

index=cs 
| rex "Type=(?<type>[a-z]+)"
| rex field=AResponse.BResponse.Message mode=sed "s/Ref number+\w+\sfailed on num:*+/" . type . " failed on num: /g"

[Chandrasekhar6]

I am getting this error 

Error in 'rex' command: Failed to initialize sed. Failed to parse the replacement string

When I removed double quotes getting this ouput :           . type . failed on num