Count the occurrences of words in a String - String Operations

[VelMurugan]

Count the occurrences of words in a String

You can adopt multiple ways to find the occurrence of a word in a string. One of them is to use the String.IndexOf() which is one of the ways of finding the occurrence of the word. In VB.NET, use String.InStr().
Another simple way is to use ‘Count’ property of the Regex.Matches() collection. However this method is slow. We will explore both these methods in the sample.

C#
   

Code: [Select]

  string strOriginal = "These functions will come handy";
    string strModified = String.Empty;

// Using IndexOf
     int strt = 0;
     int cnt = -1;
     int idx = -1;
     strOriginal = "She sells sea shells on the sea shore";
     string srchString = "sea";
     while (strt != -1)
     {
         strt = strOriginal.IndexOf(srchString, idx + 1);
         cnt += 1;
         idx = strt;
     }
     MessageBox.Show(srchString + " occurs " + cnt + " times");
 
 
    // Using Regular Expression
     System.Text.RegularExpressions.Regex rex = new System.Text.RegularExpressions.Regex(srchString);
    int count = rex.Matches(strOriginal).Count;
    MessageBox.Show(srchString + " occurs " + count + " times");
VB.NET
   

Code: [Select]

      Dim strOriginal As String = "These functions will come handy"
    Dim strModified As String = String.Empty

 ' Using IndexOf
       Dim strt As Integer = 0
       Dim cnt As Integer = -1
       Dim idx As Integer = -1
       strOriginal = "She sells sea shells on the sea shore"
       Dim srchString As String = "sea"
       Do While strt <> -1
             strt = strOriginal.IndexOf(srchString, idx + 1)
             cnt += 1
             idx = strt
       Loop
       MessageBox.Show(srchString & " occurs " & cnt & " times")
 
 
      ' Using Regular Expression
       Dim rex As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex(srchString)
      Dim count As Integer = rex.Matches(strOriginal).Count
      MessageBox.Show(srchString & " occurs " & count & " times")

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