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Currently, as of 2022, Google Analytics 4 (GA4) does not have the same kind of filter functionality that Universal Analytics (UA) has, such as search-and-replace filters to modify data. You can’t directly create a filter in GA4 to append a certain string before the page view paths. However, you can use GA4’s advanced event modification capabilities to achieve similar results.
You’d need to utilize GA4’s “Modify events” feature. You could create a new event parameter, let’s call it “modified_url”, that combines the “/from-somehost” string with the URL, based on the condition of the host being “somehost.org”. Then, in your reports, you would use this new parameter to track the page views.
Remember that any changes you make would only apply to data going forward and not to historical data. It’s advisable to consult with a professional or do thorough research before making these changes as they could dramatically affect your data reporting.
