(编辑:没有意识到“裸链接”的问题，对不起)

从这里开始:

string myString = "find Me and replace ME";
string strReplace = "me";
myString = Regex.Replace(myString, "me", strReplace, RegexOptions.IgnoreCase);

似乎你不是第一个抱怨字符串不区分大小写的人。

这样不行吗?我想象不出还有什么比这更快更简单的方法了。

public static class ExtensionMethodsString
{
    public static string Replace(this String thisString, string oldValue, string newValue, StringComparison stringComparison)
    {
        string working = thisString;
        int index = working.IndexOf(oldValue, stringComparison);
        while (index != -1)
        {
            working = working.Remove(index, oldValue.Length);
            working = working.Insert(index, newValue);
            index = index + newValue.Length;
            index = working.IndexOf(oldValue, index, stringComparison);
        }
        return working;
    }
}

扩展让我们的生活更简单:

static public class StringExtensions
{
    static public string ReplaceInsensitive(this string str, string from, string to)
    {
        str = Regex.Replace(str, from, to, RegexOptions.IgnoreCase);
        return str;
    }
}

你可以用微软。VisualBasic命名空间来查找这个帮助函数:

Replace(sourceString, "replacethis", "withthis", , , CompareMethod.Text)

.Net Core有这个内置的方法: 替换(String, String, StringComparison) Doc。现在我们可以简单地写: “…”。替换("oldValue"， "newValue"， stringcompare . ordinalignorecase)

我的这个方法可以忽略大小写以及只选择整个单词

public static string Replace(this string s, string word, string by, StringComparison stringComparison, bool WholeWord)
{
    s = s + " ";
    int wordSt;
    StringBuilder sb = new StringBuilder();
    while (s.IndexOf(word, stringComparison) > -1)
    {
        wordSt = s.IndexOf(word, stringComparison);
        if (!WholeWord || ((wordSt == 0 || !Char.IsLetterOrDigit(char.Parse(s.Substring(wordSt - 1, 1)))) && !Char.IsLetterOrDigit(char.Parse(s.Substring(wordSt + word.Length, 1)))))
        {
            sb.Append(s.Substring(0, wordSt) + by);
        }
        else
        {
            sb.Append(s.Substring(0, wordSt + word.Length));
        }
        s = s.Substring(wordSt + word.Length);
    }
    sb.Append(s);
    return sb.ToString().Substring(0, sb.Length - 1);
}