-- Assuming your table is named device_stats
SELECT 
    Device_Type,
    REGEXP_REPLACE(
        REGEXP_REPLACE(
            Stats_Access_Link, 
            E'<url>https?://([^<]+)</url>', 
            '\\1', 
            'g'
        ), 
        E'[^a-zA-Z0-9\\._]+', 
        '', 
        'g'
    ) AS Extracted_URL
FROM 
    device_stats;