[Solved] ASP.Net Regular Expression Error: Character range is out of order

Hi,

I am new to regular expressions and have been given the following regular expression:

var reg = new Regex(@"^[\s\p{L}•-]");

1. I know that \p{L} matches a single code point in the category "letter".
2. I know that \s metacharacter is used to find a whitespace character.
3. I know that this regexp is to check if a line starts with a whitespace, a letter, the bullet character or the - character.

But if I need to check also if a line starts with a number this is the solution?

var reg =newRegex(@"^[\s\p{L}•-[1-9][0-9]?$|^100$]");

On https://regex101.com/r/j8oH20/1 I have pattern error.

Can someone help me?

Any help would greatly appreciate.

Thank you.