Google analytics regexp 3 words

^(\W\w+\b){3}\W$

Keywords

https://analytics.google.com/analytics/web/?authuser=1#/report/trafficsources-all-traffic/a113520791w169100096p169120992/u.date00=20200201&_u.date01=20200225&.useg=user6-hbiyF8SYqFXVkfth7Qtw&explorer-segmentExplorer.segmentId=analytics.keyword&explorer-table.plotKeys=%5B%5D