C adding a character in a string

Question

I know I can append to a string but I want to be able to add a specific character after every 5 characters within the string  from this string alpha   abcdefghijklmnopqrstuvwxyz  to this string alpha   abcde-fghij-klmno-pqrst-uvwxy-z

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string   lines   Regex Split value     5       string out       foreach  string line in lines            out     -    line    out   out Substring 1

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Remember a string is immutable so you will need to create a new string    Strings are IEnumerable so you should be able to run a for loop over it  using System  using System Collections Generic  using System Linq  using System Text   namespace ConsoleApplication1       class Program               static void Main string   args                        string alpha    abcdefghijklmnopqrstuvwxyz               var builder   new StringBuilder                int count   0              foreach  var c in alpha                                builder Append c                   if     count   5     0                                        builder Append  -                                                Console WriteLine  Before   0    alpha               alpha   builder ToString                Console WriteLine  After   0    alpha                       Produces this   Before  abcdefghijklmnopqrstuvwxyz After  abcde-fghij-klmno-pqrst-uvwxy-z

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I had to do something similar  trying to convert a string of numbers into a timespan by adding in   and    Basically I was taking 235959999 and needing to convert it to 23 59 59 999  For me it was easy because I knew where I needed to  insert  said characters   ts   ts Insert 6       ts   ts Insert 4       ts   ts Insert 2         Basically reassigning ts to itself with the inserted character  I worked my way from the back to front  because I was lazy and didn t want to do additional math for the other inserted characters   You could try something similar by doing   alpha   alpha Insert 5  -    alpha   alpha Insert 11  -      add 1 to account for 1 - alpha   alpha Insert 17  -      add 2 to account for 2 -

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You may define this extension method   public static class StringExtenstions               public static string InsertCharAtDividedPosition this string str  int count  string character                        var i   0              while    i   count    i - 1   lt  str Length                                str   str Insert  i   count    i - 1    character                             return str                    And use it like   var str    abcdefghijklmnopqrstuvwxyz   str   str InsertCharAtDividedPosition 5   -

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string alpha    abcdefghijklmnopqrstuvwxyz   string newAlpha       for  int i   5  i  lt  alpha Length  i    6      newAlpha   alpha Insert i   -      alpha   newAlpha

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You can use this  string alpha    quot abcdefghijklmnopqrstuvwxyz quot   int length   alpha Length   for  int i   length -   length - 1    5   1   i  gt  0  i -  5        alpha   alpha Insert i   quot - quot       Works perfectly with any string  As always  the size doesn t matter

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Inserting Space in emailId field after every 8 characters  public string BreakEmailId string emailId        string returnVal   string Empty      if  emailId Length  gt  8                       for  int i   0  i  lt  emailId Length  i    8                returnVal    emailId Substring i  8                              return returnVal

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Here is my solution  without overdoing it       private static string AppendAtPosition string baseString  int position  string character                var sb   new StringBuilder baseString           for  int i   position  i  lt  sb Length  i     position   character Length               sb Insert i  character           return sb ToString                Console WriteLine AppendAtPosition  abcdefghijklmnopqrstuvwxyz   5   -

[.net] C# adding a character in a string

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