Re: Ability to match against message body using lookup()

Darren Spruell writes:

> Greetings,
>
> I have a use case where I have short but growing list of patterns I'd
> like to match against for filtering. I'd like the matches to be limited
> to the Subject header and message body (but no other headers). I also
> like the capability lookup() provides to stash patterns in a file (with
> comments/etc.). I can see from the documentation that matching against a
> concise expression (e.g. $MATCH1 from a header match) using lookup() is
> easy, but how can you handle an expressions that matches against the
> message body generally? Is it valid/correct to do something remotely
> like this?
>
> if ( /^Subject:\s*(.*)/ && lookup( $MATCH1, "interesting.dat" ) ||
>      lookup( //:b, "interesting.dat" ) )
> {
>    # Do stuff
> }

The only way to do a full-body scan would be something like this:

foreach /.*/:b
{
    if (lookup($MATCH, "interesting.dat"))
    {
     …

Body lookups will get done one line at a time. This will be slow, but, for  
personal use, and not overly large mail, this should be fine; but you'll  
want to make sure that you're running the current version of maildrop, which  
properly MIME-decodes message bodies, before matching them.

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