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/**
 * Check if the mail adress format is correct
 * @param str
 * @returns boolean
 */
function isMailAdress(str) {
    //var pattern = /^(.*)@(.*)\.(.*)$/i;
    var pattern = /^([-\w~!$%^&*_=+}{\'?]+(?:\.[-\w~!$%^&*_=+}{\'?]+)*)@((?:[\w_][-\w_]*)(?:\.[-\w_]+)*)\.([\w]{2,}?)$/i;
    return pattern.test(str);
}