正则表达式允许带有特定特殊字符的字母数字点网

Question

I have big .txt file which I am reading using StreamReader (C# .NET).

My requirement is to replace any of the special characters not in the list to replace with space in entire string (multiple occurrences).

List of special characters allowed is & / - ' . ) ( & / - ' . ) ( .

So far, I have tried this but it is not working the way I want it:

aLine = Regex.Replace(aLine, "[^0-9A-Za-z().&'/-]+$", " ");

Answer 1

Your current regex is doing this:

String input = "123abc[]]]]]]456:$def";
String aLine = Regex.Replace(input, "[^0-9A-Za-z().&'/-]+$", " ");
//=> "123abc[]]]]]]456:$def" 
      ^^^^^^^^^^^^^^^^^^^^^ original string (did not replace)

Remove the end of string $ anchor:

String input = "123abc[]]]]]]456:$def";
String aLine = Regex.Replace(input, "[^0-9A-Za-z().&'/-]+", " ");
//=> "123abc 456 def"

If you want to leave a space for every instance, remove the quantifier:

String input = "123abc[]]]]]]456:$def";
String aLine = Regex.Replace(input, "[^0-9A-Za-z().&'/-]", " ");
//=> "123abc       456  def"