function fancybarCode(input) {
    let numGroups = input.shift();
    let firstPattern = /(@#{1,})([A-Z][A-Za-z\d]{4,}[A-Z])(@#{1,})/g
    let secondPatern = /\d+/g


    // /(@[#]+)(?<name>[A-Za-z0-9]){6,}\1/g


    for (let el of input) {

        let matches = (el.match(firstPattern) )
        if (matches!==null) {

                let word = matches[0];

                let digitChars = [...word].filter(digit => /\d/.test(digit)).join("");
                let result = digitChars === "" ? '00' : digitChars;
                console.log(`Product group: ${result}`);


        } else {
            console.log("Invalid barcode")
        }
    }



}