Entry field specific characters

Question

How can I make it so that users cant enter anything else than 2 letters and 5 digits in this order: AA12345 ? If they for instance try to put a number first it will not register and vice versa

Answer 1

Hello,

The best way to match a particular string is to match with a regular expression.

On MAUI, you could refer to the following simple code to match the specific characters.

   private void myEntry_TextChanged(object sender, TextChangedEventArgs e)  
   {  
       Regex regex = new Regex(@"^[a-zA-Z]{2}\d{5}");  
       if (e.NewTextValue != null && e.NewTextValue.Length == 7)  
       {  
           if (!regex.IsMatch(e.NewTextValue))  
           {  
               test.Text = "Not Match!";  
           }  
           else  
           {  
               test.Text = "Matched";  
           }  
       }  
       else  
       {  
           test.Text = "Not Match!";  
       }  
   }  

You could refer to this official documentation to get more details: Regex Class.

Best Regards,

Alec Liu.

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