RegEx.IsMatch not working!!

[Sachin Gedam]

hello friends, my task is to validate data on server side..by any means... I feel regular expression "RegEx" is a simplest way to do so...so guide me for the same.. now see my regular expression for checking numeric value is "[0-9]*" and syntax for checking so is RegEx.IsMatch(targeted string, reg expression) and will return true and false. RegEx.IsMatch("0","[0-9]) will return true. RegEx.IsMatch("a","[0-9]") will return false. now RegEx.IsMatch("12fa","[0-9]*"); gives me true value, why? I used RegulaIOptins also as a third parameter...can u please correct me if I m doing wrong or give me simplest solution to check whether data is numeric, alphanumeric or alpha only...(priority is RegEx). Eagerly waiting for your reply. Sachin Gedam (Software Engg.) Pune India

[Colin Angus Mackay]

Sachin Gedam wrote: RegEx.IsMatch("12fa","[0-9]*"); gives me true value, why? Because you have 3 possible matches: 1 2 12

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[Colin Angus Mackay]

I'm assuming that what you are trying to get are strings that contain only numbers. Try this:

Regex re = new Regex(@"\D");
Match m = re.Match(someText);
if (m.Success)
{
// This is NOT a number.
}

This turns the search on its head and looks for things that are not numbers. So a successful match means that the expression contains non-numeric characters. Does this help?

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[Sachin Gedam]

yes its working colin, thanks for the solution...but i want to work on that regular expression only...i want to use [0-9]* as a regular expression...i want same code but with this regular expression...to check numbers only... Once again thanks for your kind cooperation. Sachin Gedam (Software Engg.) Pune India

[Colin Angus Mackay]

What exactly is it that you want? Because your request does not make sense. From what I can see: You want to test that a string contains numbers and only numbers. Yes or no? If it is "yes", then the code I gave will work by coming at the problem from a different angle. In other words it will match things that are not numbers. Then all you need to do is logically NOT the result of the match operation (i.e. !matchResult). So you need to explain to me what the problem is with the solution I gave. If it is "no", then you need to explain further because I cannot tell from your post what it is that you want.

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