This will match headers which contain the specified string anywhere. You can specify with the check box whether the match is case sensitive.
This will match headers which do not contain the specified string.
This will match headers which start with the specified string (including the ΓÇ£Re:ΓÇ¥ of follow-up article subjects).
This will match headers that end with the specified string.
This will match headers which exactly contain the specified string (either case sensitive or not).
This will match headers which do not exactly contain the specified string (either case sensitive or not).
This will match headers that contain the specified word.
This will match headers that contain a word which starts with the specified string.
This will match headers that contain a word which ends with the specified string.
This uses the specified regular expression to match headers. A regular expression is made up of obscure codes that can only be loved by programmers.
This uses the specified regular expression to antimatch headers. A regular expression is made up of obscure codes that are regularly forgotten by programmers.