escapeJson
Description: This function prepares the Subject to be inserted into JSON document by escaping the characters in the String using Json String rules. The function correctly escapes quotes and control-chars (tab, backslash, cr, ff, etc.)
Subject Type: String
Arguments: No arguments
Return Type: String
Examples: If the "message" attribute is 'He didn't say, "Stop!"', then the Expression ${message:escapeJson()}
will return 'He didn't say, \"Stop!\"'