Checking text query validity without actually running the query: ideas?

Hi,
I would like to implement a sort of function that does a preliminary check on the validity of the search string and ideally this function should work with both CTXCAT and CONTEXT indexes (and grammars).
Initially I thought that CTXQUERY.EXPLAIN function could do this for me, but, unless I am missing something, it only works with CONTEXT indexes and it doesn't accept a string containing a text query rewrite using CTXCAT grammar (it throws DRG-11119: operation is not supported by this index type).
Plan B would be to create an empty table with a CONTEXT index and then run the query either with the CONTEXT grammar or the CTXCAT grammar via query rewrite and if the query runs, returning no rows, presumably fast enough for this purpose, then the query string is assumed to be valid.
What I don't like much about plan B is the need for an additional table plus the "dummy" context indexes just to perform the parsing of the text query, but so far I didn't come up with more brilliant ideas.
Any thoughts?
Am I missing something that does the magic without hassle?
Thanks
Flavio

Under normal circumstances I wouldn't do this, as you say I'd just run the query and catch the error, but I need to do this inside a report refresh performed via AJAX (using Oracle Apex) and the catch is that when such refresh fails owing to a syntax error, the partial refresh mechanism of APEX becomes broken, so even if you amend the query and submit a new valid string, it won't show up any more.
That's why I need to be sure that the string is valid before running the query, hence the syntax checking function.
The google-style parser sounds interesting, may be I can try to implement it in a future release of my app!
Thanks
Flavio

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