function trim(str){
    return str.replace(/^\s+|\s+$/g,"");
}

function replaceAll(string, caracterOriginal, caracterSubstituto){
    return string.replace(new RegExp(caracterOriginal, 'g'),caracterSubstituto);
}

function isEmail(mail){
    var er = new RegExp(/^[A-Za-z0-9_\-\.]+@[A-Za-z0-9_\-\.]{2,}\.[A-Za-z0-9]{2,}(\.[A-Za-z0-9])?/);
    if(typeof(mail) == "string"){
        if(er.test(mail)){
            return true;
        }else{
            return false;
        }
    }
}