对于包含元音和辅音组的示例文本：

Regex.Split("Hello World","(?<=[aeiou])(?=[^aeiou])|(?<=[^aeiou])(?=[aeiou])|(?<= )")

但是，示例输入和输出还显示了其他两种字符类型（标点符号-！）和空格上的拆分，因此，您不妨直接编写一个IEnumerable扩展方法。

void Main()
{
    "Hello World!".it().Dump();
}
public static class StringExtensions
{
    public static IEnumerable<char[]> it(this string s)
    {
        if (string.IsNullOrEmpty(s))
            yield break;
        
        var z = CharacterClass(s[0]);
        var chars = new List<char>();
        foreach(var c in s)
        {
            var c2=CharacterClass(c);
            if (c2!=z)
            {
                yield return chars.ToArray();
                chars.Clear();
                z=c2;
            }
            chars.Add(c);
        }
        yield return chars.ToArray();
    }
    
    public static int CharacterClass(char c)
    {
        // 1 = vowel
        // 2 = space characters
        // 3 = punctuation
        // 0 = everything else
        var classes = new Dictionary<char,int> {{'a',1},{'e',1},{'i',1},{'o',1},{'u',1},{' ',2},{'!',3}};
        if (classes.Keys.Contains(c))
        {
            return classes[c];
        }
        return 0;
    }
}