I tried to check if a string Name contains letters, numbers, and underscore character with the following code without success, any idea of what I miss here?

var regex = new Regex(@"^[a-zA-Z0-9]+$^w+$");

        if (regex.IsMatch(Name) )

....

in addtion when I tried with the following code, I got a parsing error

"^[a-zA-Z0-9_]+$" - Unrecognized escape sequence _.

Var regex = new Regex(@"^[a-zA-Z0-9_]+$");

---

The regex should be:

@"^[a-zA-Z0-9_]+$"

You don't need to escape the underscore. You can also use the Regex.Ignorecase option, which would allow you to use @"^[a-z0-9_]+$" just as well.

---

Try this regex

^[a-zA-Z0-9_-]$

You can match name with length also by this regex

^[a-zA-Z0-9_-]{m,n}$

Where
m is the start index
n is the end index

Regex Demo

Take a look at here

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