C#/StringExtension.cs

   1 using System.Collections.Generic;
   2
   3 namespace IEnumerableExtras
   4 {
   5     /// <summary>
   6     /// Provides extension method to split a <see cref="string"/> while keeping the separator.
   7     /// </summary>
   8     public static class StringExtension
   9     {
  10         /// <summary>
  11         /// Split this string keeping separator in the result.
  12         /// </summary>
  13         /// <param name="str"></param>
  14         /// <param name="value"></param>
  15         /// <returns></returns>
  16         public static IEnumerable<string> SplitAround( this string str, string value )
  17         {
  18             var res = new List<string>();
  19             var l = value.Length;
  20             var n = str.Length;
  21             var i = 0;
  22
  23             do
  24             {
  25                 var j = str.IndexOf( value, i == 0 ? 0 : i + 1 );
  26
  27                 if ( j != -1 )
  28                 {
  29                     if ( j != i )
  30                     {
  31                         res.Add( str.Substring( i, j - i ) );
  32                     }
  33
  34                     res.Add( str.Substring( j, l ) );
  35                     i = j + l;
  36                 }
  37                 else
  38                 {
  39                     res.Add( str.Substring( i ) );
  40                     break;
  41                 }
  42             }
  43             while ( i < n );
  44
  45             return res;
  46         }
  47     }
  48 }