Create Regex pattern for Email Addresses

For creating email addresses is allowed to insert only these characters, please help me to create regex that allows only these characters.

http://www.novell.com/documentation/groupwise2014r2/gwsdk_admin_rest_api/data/b12nem8w.html

Invalid Characters in Internet Email Addresses
Internet email addresses must include only RFC-compliant characters, which include:

1. Numbers 0-9
2. Uppercase letters A-Z
3. Lowercase letters a-z
4. Plus sign +
5. Hyphen –
6. Underscore _
7. Tilde ~

This is my regex, I don’t understand why this {} characters not remove

var input = "?}{)(&^%#@*/.09Aa+7-8_8~_8*!";

            Regex r = new Regex("(?:[^a-z0-9-+'-'-_-~])", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);                
            var dd =  r.Replace(input, "_");
            
            Console.WriteLine(dd);
            Console.Read();

>Solution :

Look at your pattern:

a-z0-9-+'-'-_-~

Breaking that down, you allow:

• a to z
• 0 to 9
• -, +
• ' to ' – a single character
• _ to ~ – a range of 32 characters, which includes both { and }

Fix your regex pattern to only include the valid characters, and your code will work:

Regex r = new Regex("(?:[^a-z0-9\\-+'_~])", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);

Output:

_____________09_a+7-8_8~_8__

.NET Regular Expressions | Microsoft Docs