用户名仅允许中文的正则表达式

    protected void imbnLogin_Click(object sender, ImageClickEventArgs e)
    {
        if (Regex.IsMatch(txtUserName.Text.Trim(), @"^[\u4e00-\u9fa5](\s*[\u4e00-\u9fa5])*$"))
        {
            lblMessage.Text = "可以用户名．";
        }
        else
        {
            lblMessage.Text = "用户名仅允许中文．";
        }
    }