Escaping special characters from LLD macro values in JSONPath

Starting with Zabbix 4.4.4, when low-level discovery macros are used in JSONPath preprocessing and their values are resolved, the following rules of escaping special characters are applied:

only backslash (\) and double quote (") characters are considered for escaping;
if the resolved macro value contains these characters, each of them is escaped with a backslash;
if they are already escaped with a backslash, it is not considered as escaping and both the backslash and the following special characters are escaped once again.

For example:

JSONPath	LLD macro value	After substitution
$.[?(@.value == "{#MACRO}")]	special "value"	$.[?(@.value == "special \"value\"")]
	c:\temp	$.[?(@.value == "c:\\temp")]
	a\\b	$.[?(@.value == "a\\\\b")]

When used in the expression the macro that may have special characters should be enclosed in double quotes:

JSONPath	LLD macro value	After substitution	Result
$.[?(@.value == "{#MACRO}")]	special "value"	$.[?(@.value == "special \"value\"")]	OK
$.[?(@.value == {#MACRO})]	special "value"	$.[?(@.value == special \"value\")]	Bad JSONPath expression

When used in the path the macro that may have special characters should be enclosed in square brackets and double quotes:

JSONPath	LLD macro value	After substitution	Result
$.["{#MACRO}"].value	c:\temp	$.["c:\\temp"].value	OK
$.{#MACRO}.value	c:\temp	$.c:\\temp.value	Bad JSONPath expression

Documentation

Escaping special characters from LLD macro values in JSONPath