c# - TextBox validation in asp.net C# for first 2 characters as "Character" only

Question

I need a validation in text box that when i enter some value in text box, the first two characters should be characters only, followed by 5 int's, then a hyphen and then two int's. E.g : EM12345-23. Can i achieve such validation at aspx level only.?

Answer 1

用户asp RegularExpressionValidator

这是一个例子：

<asp:RegularExpressionValidator Display="Dynamic" ID="regexp" runat="server" ControlToValidate="regexptest" ValidationGroup="regexptest" ValidationExpression="^[A-Za-z]{2}.+$">

Answer 2

是的。你可以。使用正则表达式验证器。

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
     ControlToValidate="txtCode" Display="Dynamic" ErrorMessage="Invalid Code"
     ForeColor="Red" ValidationExpression="^[A-Za-z]{2}\d{5}-\d{2}$">  
</asp:RegularExpressionValidator>

Answer 3

是的。使用正则表达式。可以写成

string regex = ^[A-Z]{2}\d{5}-\d{2}$

这将导致前 2 个字符仅是大写字母。如果您希望它们成为他们使用的任何东西

string regex = ^[A-Za-z]{2}\d{5}-\d{2}$

验证您的输入。

Regex regex = new Regex(regex);
bool result = regex.IsMatch(textBox1.Text);

if(result)
{
    //success
}
else
{
    //Failed
}

希望能帮助到你。