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Hi,

I am working in C# Application, I want to do validation of textbox that It should not allow me more than one back slash and more than one hyphen. So can anyone tell me how to do using Regular expression validation?

I'll be grateful for your help.

Thanks,
Hetal Gadhavi
Posted
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Sampath Kumar Sathiya 26-Dec-12 2:40am
   
Hi,

Try to find answer from this,

http://www.regexlib.com
   
What did you try so far? Or do you want someone to write the Regular Expression for you. Why? This is not how it works. Write one, explain what is the problem if you fail to achieve what you want.
—SA

1 solution

That isn't easy in a single regex - that isnt what they were created for, and it is a bit of a pain to implement, as you have to allow for all possible permutations yourself.

If you are doing this in C# as you say, then I would do it with two simple regexes:
C#
Regex hyphens = new Regex("-");
Regex backslashes = new Regex(@"\\");
string inp = @"123-22-2\3";
if (hyphens.Matches(inp).Count > 1 || backslashes.Matches(inp).Count > 1)
    {
    // Failed
    }
   

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