var user=document.getElementById('username').value;
var password=document.getElementById('password').value;
var password_2=document.getElementById('password-2').value;

var reg_user=/^\w{3,10}$/;
var reg_password=/^\w{6,20}$/;

if(reg_user.test(user)&&reg_password.test(password)&& password===password_2) return true;
else  return false;
}

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