随机化正则表达式字符串替换

我在这里尝试做两件事，首先，为字符串提供伪本地化(让我们说)转换，其次，根据百分比比率随机替换字符串中包含的字符的机会，即:每5%-30%的时间…

此外，除此之外，我需要在字符串的开始，中间或结束(随机化)添加固定数字或特殊字符。

只是为了让大家知道，这是一个随机密码生成器。

我的问题是，我该如何将上述功能纳入我目前正在使用的代码库?更好的是，我怎样才能有效地做到这一点?

谢谢你能提供的任何帮助。

namespace pseudoLocalizer
{
class RegexTuple
{
    Regex thisRegex;
    string replaceWith;
    public RegexTuple(string expression, string replacement)
    {
        thisRegex = new Regex(expression);
        replaceWith = replacement;
    }
    public string GetReplaceWith()
    {
        return replaceWith;
    }
    public Regex GetRegex()
    {
        return thisRegex;
    }
}
class pLocalizeEngine
{
    //leet table.
    RegexTuple[] arrRegexTuples = {            
    new RegexTuple ("a", @"@"),
    new RegexTuple ("A", @"4"),
    new RegexTuple ("b", @"6"),
    new RegexTuple ("B", @"8"),
    new RegexTuple ("c", @"<"),
    new RegexTuple ("C", @"("),
    new RegexTuple ("d", @"d"),
    new RegexTuple ("D", @"D"),
    new RegexTuple ("e", @"3"),
    new RegexTuple ("E", @"3"),
    new RegexTuple ("f", @"f"),
    new RegexTuple ("F", @"F"),
    new RegexTuple ("g", @"6"),
    new RegexTuple ("G", @"9"),
    new RegexTuple ("h", @"#"),
    new RegexTuple ("H", @"#"),
    new RegexTuple ("i", @"!"),
    new RegexTuple ("I", @"1"),
    new RegexTuple ("j", @"j"),
    new RegexTuple ("J", @"J"),
    new RegexTuple ("k", @"k"),
    new RegexTuple ("K", @"K"),
    new RegexTuple ("l", @"1"),
    new RegexTuple ("L", @"7"),
    new RegexTuple ("m", @"m"),
    new RegexTuple ("M", @"M"),
    new RegexTuple ("n", @"~"),
    new RegexTuple ("N", @"N"),
    new RegexTuple ("o", @"0"),
    new RegexTuple ("O", @"0"),
    new RegexTuple ("p", @"p"),
    new RegexTuple ("P", @"P"),
    new RegexTuple ("q", @"q"),
    new RegexTuple ("Q", @"Q"),
    new RegexTuple ("r", @"2"),
    new RegexTuple ("R", @"2"),
    new RegexTuple ("s", @"$"),
    new RegexTuple ("S", @"5"),
    new RegexTuple ("t", @"+"),
    new RegexTuple ("T", @"7"),
    new RegexTuple ("u", @"u"),
    new RegexTuple ("U", @"U"),
    new RegexTuple ("v", @"v"),
    new RegexTuple ("V", @"V"),
    new RegexTuple ("w", @"w"),
    new RegexTuple ("W", @"W"),
    new RegexTuple ("x", @"x"),
    new RegexTuple ("X", @"X"),
    new RegexTuple ("y", @"y"),
    new RegexTuple ("Y", @"Y"),
    new RegexTuple ("z", @"2"),
    new RegexTuple ("Z", @"2"),
};
    public pLocalizeEngine()
    {
        //
    }
    public string Localize(string oldString)
    {
        string pLocalString = oldString;
        foreach (RegexTuple tuple in arrRegexTuples)
        {
            pLocalString = tuple.GetRegex().Replace(pLocalString, tuple.GetReplaceWith());
        }
        return pLocalString;
    }
}

private const string ValidCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890@<()!?~+";
private Random random = new Random();
private string RandomPasswordGenerator(int length)
{
    string password = string.Empty;
    while (length > 0)
    {
        password += ValidCharacters[random.Next(0, ValidCharacters.Length - 1)];
        length--;
    }
    return password;
}