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Group Chat Mention Tracker
Easy
Question
People in a group chat can tag each other inside a message. Each mention is an '@' sign immediately followed by a comma-separated list of one or more user IDs, written without spaces. "@id5" is a mention of one user; "@id5,id60,id700" covers three users at once. User IDs look like id plus a positive integer in the range 1 to 999.
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Asked at:eBay
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