How to remove ETX character from json value ?

[#1]

Hello,

I could not split a JSON due to a special ETX character existing in a JSON value, SplitJson processor returns an error that it is not a Valid JSON.

The JSON looks like that:
[ {"key_data":"val_data"},

 {"key_data":"val_ETXdata"},

 {"key_data":"val_data"},

 {"key_data":"val_data"},... ]

I used The next regex expression to replace it but it doesn't work:

\x03(?=[^"]*")

also

[\x03](?=[^"]*")

can someone show me a trick to remove it please, I would appreciate it.

[#2]

I think everything works fine, the json flowfiles are the response of an invokeHttp request to an API, I receive more than 5000 flowfiles, each flowfile contains 200 records.
Problems happen only with 4 files that contain the ETX symbol.