Bits of .NET

Replace [^a-zA-Z0-9] with an empty string.

string str = "This-is-my+++***RegexPattern&Text";
Regex rgx = new Regex("[^a-zA-Z0-9]"); 
str = rgx.Replace(str, "");

OUTPUT: ThisismyRegexPatternText

If you want to add an exception then you should add this character like this to the regex pattern (let’s assume you wish to exclude the ampersand):

[^a-zA-Z0-9 &]

string str = "This-is-my+++***RegexPattern&Text";
Regex rgx = new Regex("[^a-zA-Z0-9 &]"); 
str = rgx.Replace(str, "");

OUTPUT: ThisismyRegexPattern&Text