Question: Please provide a solution to write a regular expression as following in C#.NET: I would require a RegEx as below:

Non-Alphabets(a to z;A to Z) and Non-Numerals(0 to 9) and also non-DOT (.). Mean to say as otherthan the mentioned above i want to handle reverse way for getting regular expression as other than alphabets, otherthan numerals(0 to 9) otherthan DOT(.).

Kindly suggest the solution for the same.

The Regex: [^a-zA-Z0-9] fails when i use DOT(.) in a string such as 'Test.01'

Answer: 
`[^a-zA-Z0-9.]`
You could write C# code like so:

```
string pattern = "^[a-z0-9.]$";
Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
if (!reg.IsMatch(yourStringInput))
{
      // throw error or w/e
}

```