function exactEmails(input) {
    for (let line of input) {
        let regex = /\b[a-z\d]+[.]?[_]?[-]?[a-z\d]+@{1}[a-z]+[-]?[a-z]+[.]?[a-z]+[.][a-z]+\b/g
        if (line.match(regex) != null) {
            console.log(line.match(regex).join(''))
        }
    }
}