When a command matches, the match array is stored in a
type-safe extension field .commmand of the Message object.
First element is the command itself, then the arguments.
If the matched command was a RegExp, the first element is the
command, then the groups from the command regex, then the arguments.
Filter messages that call the given command(s)..
When a command matches, the match array is stored in a type-safe extension field
.commmandof the Message object. First element is the command itself, then the arguments.If the matched command was a RegExp, the first element is the command, then the groups from the command regex, then the arguments.