HL7 MSH-2: How do I keeping the "\" in the "^~\&"? Mapping Node

Question

Context
I'm building a mapping node.
I'm trying to force it MSH-2 to show "^~\&"

Approach:
Custom script

Snippet

message = qie.createHL7Message('UTF-8');
message.setNode("MSH", "MSH|^~\&|||||||||T|2.3||");
message.setNode("MSH-2", '^~\&');

Result
MSH|^~&|...

Answer 1

The backslash is a special character, so you need to escape it by putting two backslashes next to each other, like this:

message.setNode("MSH", "MSH|^~\\&|||||||||T|2.3||");