请把字符串A2B4C1D5E11转换成AABBBBCDDDDDEEEEEEEEEEE!

Question

请把字符串A2B4C1D5E11转换成AABBBBCDDDDDEEEEEEEEEEE!c#实现.简洁的写法!

Answer 1

StringBuilder sb = new StringBuilder();
for(int index = 0; index < str.Length; index += 2)
{
    char subStr = str[index];
    int num = Convert.ToInt32(str.Substring(index + 1, 1);
    for(int jndex = 0; jndex < num; jndex++)
    {
       sb.Append(subStr);
    }
}

Answer 2

    string msg = "A2B4C1D5E11";
    string ret = ConvertString(msg);    public string ConvertString(string input)
    {
        string pattern = @"\p{L}\d+";          // 或 @"[a-zA-Z]\d+"
        Regex regex = new Regex(pattern);
        List<LetterCount> list = new List<LetterCount>();
        StringBuilder builder = new StringBuilder();
        for (Match match = regex.Match(input); match.Success; match = match.NextMatch())
        {
            LetterCount let = new LetterCount(match.Value);
            builder.Append(let.ToString());
        }        return builder.ToString();
    }    public struct LetterCount
    {
        public char Letter;
        public int Count;        public LetterCount(string val)
        {
            Letter = val[0];
            Count = Convert.ToInt32(val.Substring(1));
        }        public string ToString()
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < Count; i++)
            {
                builder.Append(Letter);
            }
            return builder.ToString();
        }
    }

Answer 3

string rebuildStr(string _Value)
    {
        char[] _ValueList = _Value.ToCharArray();
        int flag = 0;
        int dig = 0;
        char cha = Char.MinValue;
        string finalStr = "";
        for (int i = 0; i < _ValueList.Length; i++)
        {
            if (Char.IsDigit(_ValueList[i]))
            {
                dig = dig * 10 + int.Parse(_ValueList[i].ToString());
                if (i + 1 < _ValueList.Length && Char.IsLetter(_ValueList[i + 1]))
                {
                    flag = 1;
                }
                else if (i + 1 == _ValueList.Length)
                {
                    flag = 1;
                }
            }
            else
            {
                cha = _ValueList[i];
            }
            if (flag == 1)
            {
                finalStr += new string(cha, dig);
                flag = 0;
                dig = 0;
                cha = Char.MinValue;
            }
        }
        return finalStr;
    }

Answer 4

static void Main(string[] args)
{
string sInput, sRegex;
sInput = "A3B4E11";
// A very simple regular expression.
sRegex = "[a-zA-Z]{1}[1-9]?[0-9]*";
Regex r = new Regex(sRegex);
MyClass c = new MyClass();.
MatchEvaluator myEvaluator = new MatchEvaluator(c.ReplaceCC);
Console.WriteLine(sInput);
sInput = r.Replace(sInput, myEvaluator);
Console.WriteLine(sInput);
}
    
public string ReplaceCC(Match m)
{
string strTemp = m.ToString();
string ostr = strTemp[0].ToString();
string strnewTemp = "[" + strTemp[0] + "]{"+strTemp.Substring(1,strTemp.Length-1)+"}";
Regex or = new Regex(strnewTemp);
while(!or.IsMatch(ostr))
{
ostr+=strTemp[0].ToString();
Console.WriteLine(ostr);
}
return ostr;
}

Answer 5

string s = "A2B4C1D5E11";
            char[] charry = s.ToCharArray();
            char p = '0';
            int num =0;
            StringBuilder b = new StringBuilder();            foreach (char c in charry)
            {
                if (Char.IsLetter(c))
                {
                    if (num == 0)
                    {
                        p = c;
                    }
                    else
                    {
                        string ss = new string(p, num);
                        b.Append(ss);
                        num = 0;
                        p = c;
        
                    }
                }
                else
                    if (Char.IsDigit(c))
                    {
                        if (num != 0)
                        {
                            int l = num.ToString().Length;
                            string s1 = "1";
                            string s2 = new string('0', l);
                            s2 = s1 + s2;
                            num = num + (int)Char.GetNumericValue(c) * Convert.ToInt32(s2);
                        }
                        else
                        {
                            num = (int)Char.GetNumericValue(c);
                        }
                    }
            }
            if (num != 0)
            {
                string ss = new string(p, num);
                b.Append(ss);
 
            }
            MessageBox.Show(b.ToString());

Answer 6

学习了不少：
（1） new string(char c, int count)
（2） MatchEvaluator 委托重写代码如下：
        string msg = "A2B4C1D5E11";
        string ret = ConvertString(msg);        public string ConvertString(string input)
        {
            string pattern = @"\p{L}\d+";          // 或 @"[a-zA-Z]\d+"
            Regex regex = new Regex(pattern);
            MatchHandler handler = new MatchHandler();
            MatchEvaluator evaluator = new MatchEvaluator(handler.Replace);            return regex.Replace(input, evaluator);
        }        public class MatchHandler
        {
            public string Replace(Match match)
            {
                char letter = match.Value[0];
                int count = Convert.ToInt32(match.Value.Substring(1));                return new string(letter, count);
            }
        }

Answer 7

using System.Text.RegularExpressions;
            string str = "A2B4C1D5E11";
            StringBuilder sb = new StringBuilder();
            foreach (Match m in Regex.Matches(str, @"([a-zA-Z])(\d+)"))
                sb.Append(new string(m.Groups[1].Value[0], int.Parse(m.Groups[2].Value)));
            string result = sb.ToString();

Answer 8

            string s1 = "A2B4C1D5E11";
            string s2 = "";
            MatchCollection mc = Regex.Matches(s1, @"[A-Z]\d+");
            foreach (Match match in mc) s2 = s2.PadRight(s2.Length + int.Parse(match.Value.Substring(1)), match.Value[0]);
            Console.WriteLine(s2);

Answer 9

一句话搞定            string str = Regex.Replace("A2B4C1D5E11", @"(\w)(\d+)", delegate
                (Match m)
                {
                    return new string(m.Groups[1].Value[0], Convert.ToInt32(m.Groups[2].Value));
                });