\ " " ' ' # FALSE TRUE T F NULL NA Inf break next return for while repeat if else try switch in array character complex data.frame double factor function integer list logical matrix numeric vector \b([1-9][0-9]*|0)[i]?\b \b([0-9]+[Ee][-+]?[0-9]+|([0-9]*\.[0-9]+|[0-9]+\.)([Ee][-+]?[0-9]+)?)[i]?\b (<){1,2}- [\)\(]+|[\{\}]+|[][]+