How to text box validate windows form C#

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I am trying to validate textbox in windows form app, The match should be like - first digit 1,2,or 3, second digit 1 or 2,third also 1 or 2

What I have tried:

regular expression @"^[1-3]{1}[1-2]{1}[1-2]{1}$"

But it not work...any suggestions..

Posted 28-Aug-19 12:19pm

Sam_gaik

Updated 28-Aug-19 19:54pm

Mohibur Rashid

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Mohibur Rashid 28-Aug-19 22:22pm

your regex seems ok. But how about your c# code?

Patrice T 28-Aug-19 23:02pm

Describe 'not work' and show code using the regex.

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OriginalGriff · Answer 1 · 2019-08-28T19:54:00

You can simplify the regex to just

^[123][12]{2}$

and it will work the same, but your original should work fine.
So it has to be your C# code.
Try this:

C#

private void MyTextBox_Validating(object sender, CancelEventArgs e)
    {
    if (sender is TextBox tb)
        {
        if (Regex.Match(tb.Text, "^[123][12]{2}$").Success)
            {
            // Validated OK
            e.Cancel = false;
            }
        else
            {
            // validation failed
            e.Cancel = true;
            }
        }
    }