[FTS] Wildcard, Regexp and Date Range unsupported in Query String syntax

Add wildcard, date ranges and regexp to the query string syntax.

When a user creates an index in the web admin, they can easily encounter this issue. Users are familiar with wildcard, date range, or regexp query syntax from other search solutions. The web admin search box uses query string syntax. The web admin doesn't reject the syntax, the queries just don't match any documents.