$MATCH in body

I don't seem to get a result when I try something like this:

:0 B
* \/this .*is not .*spam|(a|this) one[ -]time (e.*)?mail|not a spam|opt-in\
  |...
  |18.*o(nly|ver)|adults only|nikki
{
        :0 fwh
        | formail -A "X-Diagnostic: spam keyword or phrase in body: \"$MATCH\""
        :0:
        spam
}

The recipe matches its target, but the resulting diagnostic just says:

X-Diagnostic: spam keyword or phrase in body: ""

I get MATCH content consistently from header recipes.  Is there
something different about \/ in the body?  Using procmail v3.10.

TIA,

Jim
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