asp.net C＃中的文本框验证仅将前两个字符作为“字符”

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. Eg : EM12345-23. Can i achieve such validation at aspx level only.?

Answer 1

User asp RegularExpressionValidator

Here is an example:

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

Answer 2

Yes. You can. Use a Regex Validator .

<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

Yes. Use a Regex expression. That can be written as

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

This will cause the first 2 characters only to be capital letters. If you want them to be anything them use

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

Validate your input.

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

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

Hope it helps.