Regex Tester & Validator

Uses a positive lookbehind to match digits immediately following 'DASH_' in Reddit video URLs. This pattern extracts the video quality/resolution identifier (e.g., 720, 1080, 480) from URLs like 'DASH_720.mp4', commonly found in Reddit's video delivery paths. Note that [0-9]* allows zero or more digits, so it can match an empty string if no digits follow 'DASH_'. Useful for parsing resolution metadata from Reddit-hosted video assets.