[moredial]

The one way you can force the non alphanumeric characters is to use the % value,

ie %20 = space
%2E = .
%5C = \
%5F = _

The above should work with all search engines. You may get different results if pages are coded in utf-8.

Basically, search engines strip out all the non alphanumeric characters. In the non Latin charsets, the search string is converted to % values when the search is done.

If you are looking for script info, try live.com for most relevant results