How to Split a string into groups of five?

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2.20/5 (3 votes)

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I have this string:

string="101,102,103,105,201,250,2564,245564,212,2415,2102,5645,656";

I want to split it into groups of 5.

Output should be:

C#

array[0]=101,102,103,105,201
     [1]=250,2564,245564,212,2415
     [2]=2102,5645,656

Posted 25-May-14 20:31pm

Pranav-BiTwiser

Updated 25-May-14 20:32pm

v2

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Sergey Alexandrovich Kryukov 26-May-14 2:34am

You did not explain by what criteria do you need to split them. An example is never a definition. But a correct definition is more than half of the solution. And what's wrong with just reading standard MSDN documentation.

For the author of 78 answers, this question does not really look appropriate... :-)

—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-05-25T20:36:00

Solution 1

Please see my comment to the question: you did not really define what you want to achieve.

The problem is way too simple. You need just two things 1) correct definition of your requirements, 2) this: http://msdn.microsoft.com/en-us/library/system.string.split.aspx[^].

Probably you mean that you want to split the items by groups of 5 elements delimited by ',' and put the remaining elements (less or equal than 5) in a last group. If so, you also need to know this:
http://msdn.microsoft.com/en-us/library/3b1ff23f.aspx[^],
http://msdn.microsoft.com/en-us/library/0w4e0fzs.aspx[^]. :-)

—SA

Posted 25-May-14 20:36pm

Sergey Alexandrovich Kryukov

Updated 25-May-14 20:42pm

v3

Comments

Pranav-BiTwiser 26-May-14 2:48am

do u know how to delete the question?? which has been asked

King Fisher 26-May-14 3:04am

why do you want to delete ?

Ajith K Gatty 26-May-14 3:27am

Hi.....You dont delete this question. Just keep it. Mistakes do happen just learn from it. Mr. Sergey is a nice guy. He corrected me once. Follow his advice.

Pranav-BiTwiser 26-May-14 3:27am

coz it is not appropriate....and has been posted by my colleague, not me

Andreas Gieriet · Answer 2 · 2014-05-25T21:44:00

From Brain-To-Paper:

C#

string pattern = @"(?:^|,)(\d+(?:,\d+){1,4})";
var array = Regex.Matches(input, pattern)
                 .Cast<Match>()
                 .Select(m=>m.Groups[1].Value)
                 .ToArray();

This should work assuming the string is well formed.

[EDIT] I've tested the above code and it works (so, no any more "from-brain-to-paper"). The code below is crap, though - sorry for the wrong hint :-(
Alternatively

C#

IEnumerable<string> GetChunks(string input) { var elements = input.Split(new char[]{','}); foreach(var chunk in elements.Take(5)) { yield return string.Join(",", chunk); } } var array = GetChunks(input).ToArray();

[/EDIT]

Cheers
Andi

Anup kumar(MCA) · Answer 3 · 2014-05-25T22:07:00

C#

string str ="101,102,103,105,201,250,2564,245564,212,2415,2102,5645,656,444,555";
            string[] arl = str.Split(',');
            if (arl.Length > 5)
            {
                string[] strResult;
                int totCount = arl.Length / 5;
                int totReminder = arl.Length % 5;

                if (totReminder > 0)
                {
                    strResult = new string[totCount + 1];
                }
                else
                {
                    strResult = new string[totCount];
                }

                for (int i = 0; i < totCount; i++)
                {
                    strResult[i] = arl[i].ToString() + "," + arl[i + 1].ToString() + "," + arl[i + 2].ToString() + "," + arl[i + 3].ToString() + "," + arl[i + 4].ToString();
                }
                if (totReminder > 0)
                {
                    for (int i = 5 * totCount; i < arl.Count(); i++)
                    {
                        strResult[strResult.Length - 1] = strResult[strResult.Length - 1] + arl[i];
                        if (i < (arl.Count() - 1))
                        {
                            strResult[strResult.Length - 1] = strResult[strResult.Length - 1] + ",";
                        }
                    }
                }
            }
            else
            {
            //do the needFull
            }

Matt T Heffron · Answer 4 · 2014-06-03T07:05:00

Now that my article: Considerations on Efficient use of LINQ Extension Methods[^] is complete I can suggest:

C#

string str ="101,102,103,105,201,250,2564,245564,212,2415,2102,5645,656,444,555";
string[] groups = str.Split(',').Chunkify(5).Select(chk => string.Join(",", chk)).ToArray();

The Chunkify1 implementation (as well as Chunkify) from the article will work just fine in this case.
(This depends on .NET 4 which added the string.Join() overload taking IEnumerable<string> as the second argument.)

How to Split a string into groups of five?

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