c# - 使用正则表达式从字符串中删除标点和空格

Question

我正在尝试删除要使用 Playfair Cipher 加密的字符串中的所有标点符号和空格。我不明白为什么这条线不起作用。

s = Regex.Replace(s, @"[^\w\s]", string.Empty);

Answer 1

The [^\w\s] means remove anything that's not a word or whitespace character.

Try this instead:

s = Regex.Replace(s, @"[^\w]", string.Empty);

You could also use:

s = Regex.Replace(s, @"\W", string.Empty);

Of course that will leave underscores as those are considered word characters. To remove those as well, try this:

s = Regex.Replace(s, @"[\W_]", string.Empty);

Or this:

s = Regex.Replace(s, @"\W|_", string.Empty);

Answer 2

使用 Linq 代替 Regex 怎么样？

string str = "abc; .d";
var newstr = String.Join("", str.Where(char.IsLetterOrDigit));

Answer 3

^字符意味着不是。我用[^A-Za-z0-9-]连字符代替所有不是字母数字的东西。

Answer 4

你最好的选择可能是使用[^A-Za-z]contains \w，_我0-9猜你不想保留它。

以下正则表达式将删除任何 nota-z或A-Z.

s = Regex.Replace(s, @"[^A-Za-z]", string.Empty);