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(gnus)Advanced Scoring Syntax

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Advanced Scoring Syntax
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   Ordinary scoring rules have a string as the first element in the
rule.  Advanced scoring rules have a list as the first element.  The
second element is the score to be applied if the first element
evaluated to a non-`nil' value.

   These lists may consist of three logical operators, one redirection
operator, and various match operators.

   Logical operators:

`&'
`and'
     This logical operator will evaluate each of its arguments until it
     finds one that evaluates to `false', and then it'll stop.  If all
     arguments evaluate to `true' values, then this operator will return
     `true'.

`|'
`or'
     This logical operator will evaluate each of its arguments until it
     finds one that evaluates to `true'.  If no arguments are `true',
     then this operator will return `false'.

`!'
`not'
`¬'
     This logical operator only takes a single argument.  It returns the
     logical negation of the value of its argument.

   There is an "indirection operator" that will make its arguments
apply to the ancestors of the current article being scored.  For
instance, `1-' will make score rules apply to the parent of the current
article.  `2-' will make score rules apply to the grandparent of the
current article.  Alternatively, you can write `^^', where the number
of `^'s (carets) says how far back into the ancestry you want to go.

   Finally, we have the match operators.  These are the ones that do the
real work.  Match operators are header name strings followed by a match
and a match type.  A typical match operator looks like `("from" "Lars
Ingebrigtsen" s)'.  The header names are the same as when using simple
scoring, and the match types are also the same.