Regex for removing only specific special characters from string

问题

I'd like to write a regex that would remove the special characters on following basis:

• To remove white space character
• @, &, ', (, ), <, > or #

I have written this regex which removes whitespaces successfully:

 string username = Regex.Replace(_username, @"\s+", "");

But I'd like to upgrade/change it so that it can remove the characters above that I mentioned.

Can someone help me out with this?

回答1:

 string username = Regex.Replace(_username, @"(\s+|@|&|'|\(|\)|<|>|#)", "");

回答2:

use a character set [charsgohere]

string removableChars = Regex.Escape(@"@&'()<>#");
string pattern = "[" + removableChars + "]";

string username = Regex.Replace(username, pattern, "");

回答3:

I suggest using Linq instead of regular expressions:

 string source = ...

 string result = string.Concat(source
   .Where(c => !char.IsWhiteSpace(c) && 
                c != '(' && c != ')' ...));

In case you have many characters to skip you can organize them into a collection:

 HashSet<char> skip = new HashSet<char>() {
   '(', ')', ... 
 };

 ... 

 string result = string.Concat(source
   .Where(c => !char.IsWhiteSpace(c) && !skip.Contains(c)));

回答4:

You can easily use the Replace function of the Regex:

string a = "ash&#<>fg  fd";
a= Regex.Replace(a, "[@&'(\\s)<>#]","");

来源：https://stackoverflow.com/questions/42045115/regex-for-removing-only-specific-special-characters-from-string