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ipv6 = "2001:0db8:0000:0000:0000:ff00:0370:7331"; if (ipv6.match(/^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$/)) { console.log("Valid"); } else { console.log("Not valid"); } /* run: Valid */