如何从字符串中删除字符，除了列表中的字符 [英] How to remove characters from a string, except those in a list

问题描述

这是我的字符串值：

string str = "32 ab d32";

此列表是我允许的字符：

And this list is my allowed characters:

var allowedCharacters = new List<string> { "a", "b", "c", "2", " " };

我希望它变成：

str == " 2 ab   2";

我想用空格替换任何不在允许字符列表中的字符。

I would like to replace any character that is not in the allowed character list, with an empty space.

推荐答案

Regex？

这里是另一个没有regex的变体（修改你的 lstAllowedCharacters 实际上是可枚举的字符而不是字符串[作为变量名称的含义]）：

Here's another variation without regex (modified your lstAllowedCharacters to actually be an enumerable of characters and not strings [as the variable name implies]):

String original = "32 ab d32";
Char replacementChar = ' ';
IEnumerable<Char> allowedChars = new[]{ 'a', 'b', 'c', '2', ' ' };

String result = new String(
  original.Select(x => !allowedChars.Contains(x) ? replacementChar : x).ToArray()
);

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