how to narrow Google query to educational institution only(but not just to American ones)

Question

I often search educational institutions websites with the following Google query

my_query site:.edu 

or

my_query site:edu.pl

or

my_query site:edu.au

but it only crawls through American, Polish and Australian ones respectively. In most countries top level domain for universities is the country domain and edu is only a sub-domain, like amu.edu.pl for a uni in Poland. How can I query all edu subdomains in one query, independently of the tld they are in? for example how to search:

myquery site:edu.au site:edu.pl site:edu

domains with one google query Have tried some regular expressions and wildcard characters but without spectacular success. Anybody came across the same problem?

Answer 1

Try this

site:edu.*

Answer 2

For instance, French universities and institutions have no standard scheme for naming their websites: this can be any http://***.fr. There may be some list of educational institutions lurking somewhere, I remember having used one once.