Reduce String length using string builder

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2.50/5 (2 votes)

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Hello All,
I am software developer.Right now I have a problem.I need to reduce the size of a string using string builder...i have a string like "aaaaabbcbccc" i want a such function that count all the character one by one and gives the output like "a5b3c4".
Please help as soon as possible....

Posted 18-Jul-12 0:16am

shivammpi123

Updated 18-Jul-12 0:17am

v2

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3 solutions

Solution 3

Hi,

try this,

C#

string str = "aaaaabbcbccc";
   string newstr = "";
        foreach (char ch in str.ToCharArray())
        {
            if (!str.Contains(ch))
                newstr += ch + fncheckcount(ch).ToString();
        }

C#

private int fncheckcount(char c)
   {
       int count = 0;
       foreach (char ch in str.ToCharArray())
       {
           if (c == ch)
           {
               count++;
           }
       }
       return count;
   }

the "newstr" will has the new string value.

hope it helps.

Posted 18-Jul-12 0:28am

Karthik Harve

Solution 4

Hope this is what you want

C#

static void Main(string[] args)
        {
            string text = "aAAAAabbbcccc";
            StringBuilder sb = new StringBuilder(text.Length);

            char prevChar = text[0];
            int prevCharCount = 1;

            foreach(char c in text)
            {
                if (c == prevChar) prevCharCount++;
                else
                {
                    sb.Append(prevChar);
                    sb.Append(prevCharCount);
                    
                    prevChar = c;
                    prevCharCount = 1;
                }
            }
            sb.Append(prevChar);
            sb.Append(prevCharCount);

            Console.WriteLine(sb.ToString());
        }

Or simply use

C#

string result = "aAAbbbcccc";
Regex re = new Regex(@"(\w)\1*", RegexOptions.Compiled);
result = re.Replace(result, match => match.Value[0] + match.Length.ToString());

Cheers... :)

Posted 18-Jul-12 0:41am

JakirBB

Updated 18-Jul-12 1:02am

v3

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StianSandberg · Accepted Answer · 2012-07-18T00:27:00

Sorry. Didn't see that you tagged it with VB.NET
Anyway.. Here's my c# example. Same logic in VB, should be easy to convert..

C#

var text = "aaaabbbbcccdddbbddaaccbbdd";
var values = new Dictionary<string, int>();

for (var i = 0; i < text.Length; i++)
{
    var character = text[i].ToString();
    if (values.ContainsKey(character))
    {
        // character exists. Increase value
        values[character] ++;
    }
    else
    {
        // character does not exists. Add character
        values.Add(character, 1);
    }
}

var sb = new StringBuilder();
foreach (KeyValuePair<string, int> pair in values)
{
    sb.Append(pair.Key + pair.Value);
}
Console.WriteLine(sb.ToString());
Console.Read();

If you want to order values you can loop this way:

C#

foreach (KeyValuePair<string, int> pair in values.OrderBy(a=>a.Key))
{
    sb.Append(pair.Key + pair.Value);
}