Question

我想在我的c＃表单中验证textbox，所以我让这个方法在下面进行检查

仅允许编号。
只允许使用a-z。
用一个空格替换多个空格并返回该字符串。

问题是，即使没有a-z，唯一允许的号码总是会收到错误消息。

最后对代码的任何建议或改进？

我现在已经做了一些更新，如果他们有任何建议或改进或任何我错过的通常标准检查

编辑于20/3/2016格林尼治标准时间下午1:12

GMT时间now ：D

                public void input_validation()
    {
        string num_regex = @"^[0-9]*$";         //only digits allowed in this textbox
        string word_regex = @"[a-zA-Z]+";       //only a-z allowed in this textbox
        string Multi_spaces = @"\s+|\s{2,}";   //more than on white spaces

        Regex Nregex = new Regex(num_regex);
        Regex Wregex = new Regex(word_regex);
        Regex Mregex = new Regex(Multi_spaces);

        //To check all empty textbox within the groupbox
        foreach (var emptytxtbox in GB_CUST_INFO.Controls.OfType<TextBox>())
        {
            if (string.IsNullOrEmpty(emptytxtbox.Text.Trim()))
            {
                MessageBox.Show("Missing Information are no allowed\n","Missing Information",MessageBoxButtons.OK,MessageBoxIcon.Error);
                emptytxtbox.BackColor = Color.Red;
                return; //to stop the check on first empty textbox 
            }
            else
            {
                emptytxtbox.BackColor = Color.White; //to rest the color of missed info at pervious check
            }

            if (Mregex.IsMatch(emptytxtbox.Text))
            {
              //just replacing the more than one white spaces with one white space and retrun to its textbox
                emptytxtbox.Text = Mregex.Replace(emptytxtbox.Text," ");
            }
        }

        if (!Nregex.IsMatch(TB_CUST_PHONE1.Text))
        {
            MessageBox.Show("Only Number are allowed for phone number", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        else if (!Nregex.IsMatch(TB_CUST_PHONE2.Text))
        {
            MessageBox.Show("Only Number are allowed for mobile number", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        //else if (Mregex.IsMatch(TB_CUST_NAME.Text))
        //{   //just replacing the more than one white spaces with one white space and retrun to its textbox
        //    TB_CUST_NAME.Text = Mregex.Replace(TB_CUST_NAME.Text, " ");
        //}
        /*else if (Wregex.IsMatch(TB_CUST_NAME.Text))
        {
            MessageBox.Show("Only a-z are allowed");
        }*/
        else { cust_data_insert(); }
    }

Answer 1

如果我了解您的问题，要匹配文本框中的数字，您应该使用：

string num_regex = @"^[0-9]*$";

Answer 2

要仅测试TextBox中的数字，请尝试以下正则表达式：

string num_only_regex = @"[0-9]+$";

我自己测试过，它对我来说很好用

Answer 3

尝试：

var text = "abc12-   443";
var sanitizedText = string.Empty;

var result = Regex.Match(text, @"^[a-z0-9\s]+$",
             RegexOptions.IgnoreCase);

if (result.Success)
{
    sanitizedText = Regex.Replace(result.Value, "[ ]+", " ");
    Console.WriteLine(sanitizedText);
}
else
{
    Console.WriteLine("Invalid input: ({0})", text);
}

这应该打印：

abc12 443   #for abc12   443
Invalid input: (abc12-   443)     #for abc12- 443

请参阅Demo此处

使用RegEx验证文本框

3 个答案: