LinkedIn will do this for you - no need for regex filters!
On the list of jobs, whether they are within a group or just on the main LinkedIn job search page, the checkbox menus on the left side of the screen allow you to filter jobs by location as well as by company, industry, date posted, and many other criteria.
You can either have the location be part of your search criteria:
Or you can refine search results with location filters:
Do note that these are ways to filter in locations, as opposed to filtering them out, like you had asked for. However, the second option - filtering existing search results by location - allows you to select multiple checkboxes for your filter. So you could use that sidebar to include all countries and regions except India, for example.