Write a schema for your structure that you can validate against. Visit BoneSoft.com

I tried to count but in different way - it doesn`t work. Your way works great! Thanks a lot!

use the Key_Press event instead of the Key_down event...that should work with the same code..

regularExpression is private. Use 'RegularExpression' which is public.

It`s working :D Thank you very much :) But code e.SuppressKeyPress = true; I turned into e.Handled = true; :) -- modified at 9:50 Friday 17th March, 2006

The only way is to use sub group matching as per my example earlier. xacc.ide-0.1.3.2

Thanks a lot :) I discovered that code: System.Windows.Forms.Form NewFormObject = new MyForm(); is valid too :)

You asked me why it doesn`t work. It takes two action in the same time. First it deletes charakters (so backspace key works like should work), second it moves cursor to left like I want. In textBox works only second action which exactly I want. In richTextBox work both of them. e.Handled = true; code should make a backspace key action not allowed. Why is that? I need this action in my richTextBox to validate text which I enter to this.

Can't help you directly. However, you might find this free tool useful. http://www.ultrapico.com/Expresso.htm[^] Kevin

As militiaware writes, the Regex capabilities in .NET do not offer the option to find the place where the Regex fails to match. However, you could write your own regular expression parser to find the "best match" to your string and, then, you will know which character failed. I recommend this book, especially Chapter 8, "Parsing Regular Expressions": Title: Building Parsers With Java ISBN: 0201719622 Though the code and examples are in Java, you can easily translate it to the .NET-supported language of your choice. The design of his parser has a bestMatch() method that will return the string that best matches your given input, in this case, "[0-9][0-9]-[0-9][0-9][0-9]". "we must lose precision to make significant statements about complex systems." -deKorvin on uncertainty

You might also want to check out: [http://www.codeproject.com/dotnet/expresso.asp](http:// http://www.codeproject.com/dotnet/expresso.asp)[[^](http:// http://www.codeproject.com/dotnet/expresso.asp)] I use this all the time! Also you might want to check into: http://www.regular-expressions.info/tutorial.html[^] http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconregularexpressionslanguageelements.asp[^] http://www.devarticles.com/c/a/Java/Regular-Expressions/[^] Rocky <>< Latest Post: Snippet C# Compiler & More.. Blog: www.RockyMoore.com/TheCoder/[^]