NaiveStringSearch.cs

using System;
using System.Collections.Generic;

// Implements the traditional naive string matching algorithm in C# for TheAlgorithms/C-Sharp.
namespace Algorithms.Strings
{
   /// <summary>
   /// Implements the traditional naive string matching algorithm in C#.
   /// </summary>
   public static class NaiveStringSearch
   {
      /// <summary>
      /// NaiveSearch(Content, Pattern) will return an array containing each index of Content in which Pattern appears.
      /// Cost:  O(n*m).
      /// </summary>
      /// <param name="content">The text body across which to search for a given pattern.</param>
      /// <param name="pattern">The pattern against which to check the given text body.</param>
      /// <returns>Array containing each index of Content in which Pattern appears.</returns>
      public static int[] NaiveSearch(string content, string pattern)
      {
         int m = pattern.Length;
         int n = content.Length;
         List<int> indices = new List<int>();
         for (int e = 0; e <= (n - m); e++)
         {
            int j;
            for (j = 0; j < m; j++)
            {
               if (content[e + j] != pattern[j])
               {
                  break;
               }
            }

            if (j == m)
            {
               indices.Add(e);
            }
         }

         return indices.ToArray();
      }
   }
}