Dollar is a node to anchor at the end of a line or the
end of input based on the multiline mode.
When not in multiline mode, the $ can only match at the very end
of the input, unless the input ends in a line terminator in which
it matches right before the last line terminator.
Note that \r\n is considered an atomic line terminator.
Like ^ the $ operator matches at a position, it does not match the
line terminators themselves.
public function match(matcher:Object, i:Number, seq:String):Boolean