i have only a single texbox.i want to display names , date,p

Question

i have only a single texbox.i want to display names , date,priortiy in the same textbox when i typed @ names should be display names like when u type comment in facebook for particular person it will display name. when i type ! date should be display and when i type * priority should be display in same textbox like

example @ names !today date or tomorrow date etc * priority high,low ,medium etc