Query symbols for advances search
Would be nice to be able to do some advance (date, fields, author) search using text symbol. This need to be very easy to write: no hard to type symbol like "[" or "{", and permissive like date:1987 date:jan-87 date:last month.
When you start using those kind of symole extra keyword should be before or in a specific operator:
Google has similar feature: https://support.google.com/websearch/answer/2466433?visit_id=1-636289322196144672-2655260816&p=adv_operators&hl=en&rd=1
I'm sure some others peoples already did some kind of work/standard on that