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Matches YouTube watch URLs specifically for the video ID 'Erp8IAouus', allowing optional http/https protocol (with optional colon), subdomains like www or www1-9, and an optional trailing &ab_channel parameter. The global and multiline flags enable finding multiple occurrences across lines. Best suited for detecting or extracting links to this one particular video in text, e.g., filtering or auto-embedding a specific YouTube video.