correlated query contains not working

Question

1) the rules table stores complex terms for FTS (e.g. '"*endwith" and "startwith*" or (...)')
2) the documents table stores contents of user's documents 
3) create a view to display all matches between rules.keywordTerms and documents.documentTexts

create view vuRulesMatchedToDocumentTexts
as
select r.keywordTerms, d.documentTexts
from rules r
cross apply 
	(
	select documentID, documentTexts 
	from documents 
	where contains(documentTexts,r.keywordTerms)
	) d
go

Msg 102, Level 15, State 1, Line 8
Incorrect syntax near 'r'.

Answer 1

e.g. '"*endwith"

FTS don't support prefix wildcard search; you don't get it working.

Answer 2

It seems that the second parameter of CONTAINS does not allow this. As alternative, probably you can define a stored procedure and use a cursor.

Or perhaps you can define a function like this:

create function vuRulesMatchedToDocumentTexts( )
returns @t table (documentID int, documentText nvarchar(max))
as
begin
	declare @all_rules nvarchar(2000) = (select string_agg(keywordTerms, ' OR ') from rules)

	insert into @t
	select documentID, documentTexts
	from documents 
	where contains(documentTexts, @all_rules) 

	return
end

Usage:

select * from vuRulesMatchedToDocumentTexts()

If you are interested in a stored procedure that uses cursors or other alternatives, then show details about your tables (with sample rows) and the expected output, and the version of SQL Server.