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string s = "ssyyaillxx";
s = Regex.Replace(string.Join(string.Empty, s.OrderBy(c => c).ToArray()), @"(.)\1+", string.Empty);
Console.WriteLine(s);
static void Main(string[] args)
{
var testString = "aaabbbcdefffkffff";
var charArray = testString.ToCharArray();
var length = charArray.Length;
StringBuilder sb = new StringBuilder();
List<string> returnValue = new List<string>();
for (int i = 1; i < length; i++)
{
var current = charArray[i];
if (i < length-1)
{
if (current == charArray[i + 1] || current == charArray[i - 1])
{
if (sb.Length != 0)
{
returnValue.Add(sb.ToString());
sb.Clear();
}
continue;
}
else
{
sb.Append(current);
}
}
else
{
if (current == charArray[i - 1])
{
continue;//检测最后一个字符是否有重复
}
else
{
sb.Append(current);
}
}
}
if (sb.Length != 0)
{
returnValue.Add(sb.ToString());
}
foreach (var temp in returnValue)
{
Console.WriteLine(temp);
}
Console.ReadLine();
}
string str = @"dgsagsdretdddtetwq";
char[] chars = str.ToList<char>().Distinct().ToArray<char>();
str = new string(chars);
string test_str = "ssyyaillxx";
test_str=string.Join("",test_str.ToCharArray().GroupBy(a => a).Where(a => a.Count() == 1).Select(a=>a.Key).ToArray());//ai
var str = "ssyyaillxx";
var filter = str.ToCharArray().GroupBy(s => s).Where(g => g.Count() == 1).Select(g => g.Key);
var result = string.Join("", filter.ToArray());
Console.WriteLine(result);
Console.Read();
string s = "ssyyaillxx";
int i = s.IndexOf("ai");
s = s.Substring(i, 2);