Thanks for your advice. I was thinking there is no real VBA talk around Word and I'm glad I was wrong. I did understand it the first time. I do not know how Word treats "(()())", do you know? In Excel constructions like "(()())" work perfectly. But I do not know about Word.

Do you want to say that "i((([क-ह]|[क़-य़])्)+)" should be written down to "i\(\(\([क-ह]|[क़-य़]\)्\)\+\)" like that?
So nested syntax "(()())" does not work at all?
So I should rewrite (([क-ह]|[क़-य़])्)h as([क-ह]्|[क़-य़]्)h code?