去掉特殊字符（udc52），文本显示是空格

百度好久，正则处理（字符显示�􀖣􀡙）

如何：从字符串中剥离无效字符 | Microsoft Learn

using System;
using System.Text.RegularExpressions;

public class Example
{
    static string CleanInput(string strIn)
    {
        // Replace invalid characters with empty strings.
        try {
           return Regex.Replace(strIn, @"[^\w\.@-]", "",
                                RegexOptions.None, TimeSpan.FromSeconds(1.5));
        }
        // If we timeout when replacing invalid characters,
        // we should return Empty.
        catch (RegexMatchTimeoutException) {
           return String.Empty;
        }
    }
}