Issue with NIFI extracting Attribute from flow file

[#1]

I need to get the sys_id into an attribute and have tried the following:

1. SplitJSON and EvaluateJSONPath but SplitJSON ends gets an EDT error based on the contents of the JSON.

1.1 SplitJSON

1.2 EvaluateJSONPath

2. Now I'm trying to cleanse the content in hopes I can just throw the one thing I need over to EvaluateJSONPath.  Currently having problems getting regex expression to function on flowfile to select all but one line and replace it with null.  

Regex expression tried:  ^(?!.*sys_id).*$

Flowfile content (sanitized and shortened)

{

  "result" : {

    "start_date" : "",

    "sla_due" : "UNKNOWN",

    "escalation" : "Normal",

    "sys_id" : "3614ce021b030d10c3598512f54bcb2d",

    "upon_approval" : "Proceed to Next Task",

    "correlation_id" : "",

    "made_sla" : "true",

    "backout_plan" : "",

    "conflict_status" : "Not Run",

    "sys_created_on" : "2022-04-25 09:36:27",

    "on_hold_task" : "",

    "display_value" : "global"

  }

}

[#2]

@Tra

The recommend path forward here is to use a JSON Record Reader and JSON Record Writer with schema matching your source (reader) and downstream needs.  You want to avoid splitjson and regex matching flow file contents.