Type: string
Default: "~f %s !~P | (~P ~C %s)"
This variable controls how send-hooks, message-hooks, save-hooks, and fcc-hooks will be interpreted if they are specified with only a simple regexp, instead of a matching pattern. The hooks are expanded when they are declared, so a hook will be interpreted according to the value of this variable at the time the hook is declared. The default value matches if the message is either from a user matching the regular expression given, or if it is from you (if the from address matches `` $alternates'') and is to or cc'ed to a user matching the given regular expression.