exists(%HEADERS[“Header”])

Returns “TRUE” or “FALSE” based on the existence of a header, or a param in the message.

exists(%HEADERS[“Header”].PARAMS[“Param”])

remove(%HEADERS[“Header”])

Removes a header or a parameter from the message.

remove(%HEADERS[“Header”].PARAMS[“Param”])

%HEADERS[“Header”].regex_match(“regex”)

Returns “TRUE” or “FALSE” based on whether the regular expression found a match in the text or not.

%HEADERS[“Header”].PARAMS[“Param”].regex_match(“regex”)

%HEADERS[“Header”].regex_get(“regex”)

Returns the extracted string by the regular expression. The return value will be an empty string if no match was found.

%HEADERS[“Header”].PARAMS[“Param”].regex_get(“regex”)

HEADERS[“Header”].regex_replace(“regex”, “string”)

Replaces a given match with the provided string within the header string or a param.

%HEADERS[“Header”].PARAMS[“Param”].regex_replace(“regex”, “string”)