You would need to buy the following two addons.
- http://bulkwp.com/addons/bulk-delete-posts-by-content/
- http://bulkwp.com/addons/scheduler-for-deleting-posts-by-content/
I am hopping on to a plane now. I checked mysql documentation and it seems it will work with Arabic.
In case it is not working then I will fix it for you once I am back or refund the money if I am not able to fix it for you.