Unity short string intercepts long string

Unityl short string intercepts long string

    string changStr = "12388888456789";
    string duanStr = "88888";
    string[] curstr = Regex.Split(changStr, duanStr, RegexOptions.IgnoreCase);
    for(int i=0;i< curstr.Length;i++)
    {
        Debug.Log(curstr[i]);
    }

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