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Matches Google video CDN hostnames ending in gvt1.com, structured as 3 alphanumerics, three hyphens, then hyphen-separated alphanumeric segments of 2, 9, and 4 characters. These auto-generated server names (e.g., r3---sn-xxxx-xxxx.gvt1.com) deliver video content for YouTube, SnackVideo, and other apps. Typically used in proxy/ad-blocking rule sets to route or filter social media video streaming traffic.