See demo

Occurrence Of A String Demo

Background

Today I have got a requirement of creating a function which performs some operations according to the occurrence of a string in a given string. Like, if a string pattern contains more that one time in a given string, it must do some actions and if it is just one time it should do other actions. I have done this in two ways, here I am sharing you that. I hope some one may find it is useful.

Using the code

We are going to discuss the following two ways to achieve this requirement.

We will start with a Regex class first.

To start with Regex, you need to add another namespace as given below.

[csharp]
using System.Text.RegularExpressions;
[/csharp]

Now consider we have designed our page as follows.

[html]
<div>
<table >
<tr>
<td>
<asp:Label ID="lblInputString" runat="server" Text="Input String"></asp:Label>
</td>
<td>
<textarea id="txtInputString" runat="server"></textarea>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblPattern" runat="server" Text="Pattern String"></asp:Label>
</td>
<td>
<textarea id="txtPattern" runat="server"></textarea>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnCheckOccurance" runat="server" Text="Check Occurance" OnClick="btnCheckOccurance_Click" />
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblOutput" runat="server" Text="See Output Here!!! <i> Thank you for visiting. Please Visit Again!!! </i>"></asp:Label>
</td>
</tr>
</table>
</div>
[/html]

And Some CSS styles as follows.

[css]
<style type="text/css">
textarea {
width: 630px;
height: 100px;
}

table {
border: 1px solid #ccc;
padding: 10px;
width: 800px;
text-align:center;
}

tr {
border: 1px solid #999;
border-radius: 5px;
}

td {
border: 1px solid #999;
padding: 10px;
border-radius: 5px;
}
</style>
[/css]

If you add the above codes and CSS, your page may looks like in the preceding image.

Now we will see our C# code. Please add the below lines of codes in the button click event.

[csharp]
protected void btnCheckOccurance_Click(object sender, EventArgs e)
{
int occuranceCount = 0;

//Checking Occurance
occuranceCount = Regex.Matches(txtInputString.Value.ToLower().Trim(), txtPattern.Value.ToLower().Trim()).Count;
if (occuranceCount > 0)
lblOutput.Text = "<br/><br/><b>Sibeesh Passion </b>Says <br/><br/>The given string pattern <i>" + txtPattern.Value + "</i> Contains " + occuranceCount + " times in <i>"
+ txtInputString.Value + "</i><br/><br/> Thank you for visiting. Please Visit Again!!!";
else
lblOutput.Text = "<br/><br/><b>Sibeesh Passion </b>Says <br/><br/>The given string pattern <i>" + txtPattern.Value + "</i> Is not occured s in <i>"
+ txtInputString.Value + "</i><br/><br/> Thank you for visiting. Please Visit Again!!!";
//End
}
[/csharp]

In the above code, we are finding the occurrence of a string by using a Regex.Matches function. The Regex.Matches function expects two parameters.

We are getting those two values from our texarea and pass as follows.

[csharp]
Regex.Matches(txtInputString.Value.ToLower().Trim(), txtPattern.Value.ToLower().Trim()).Count;
[/csharp]

Now if you run application, you will get output as follows.

As you can see I have given the words, “Sibeesh” and “passion” for testing, and it gave the correct number of occurrence right?

Now we will see how we can do this by Using a Custom Function.

Following in our function call.

[csharp]
occuranceCount = FindOccurrences(txtInputString.Value.ToLower().Trim(), txtPattern.Value.ToLower().Trim());
[/csharp]

And please find the function body below.

[csharp]
#region FindOccurrences
/// <summary>
/// This method is used to get the Count of Occurrences of a string in a string
/// </summary>
/// <param name="InputString"></param>
/// <param name="patternString"></param>
/// <returns>Int</returns>
public int FindOccurrences(string InputString, string patternString)
{
// Here we are looping through InputString
int intCount = 0;
int i = 0;
while ((i = InputString.IndexOf(patternString, i)) != -1)
{
i += patternString.Length;
intCount++;
}
return intCount;
}
#endregion
[/csharp]

Now if your run you will get the same output as we got by using a Regex function.

Now we will see our complete codes.

Complete Code

Default.aspx.cs

[csharp]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnCheckOccurance_Click(object sender, EventArgs e)
{
int occuranceCount = 0;

//Checking Occurance
//occuranceCount = Regex.Matches(txtInputString.Value.ToLower().Trim(), txtPattern.Value.ToLower().Trim()).Count;
occuranceCount = FindOccurrences(txtInputString.Value.ToLower().Trim(), txtPattern.Value.ToLower().Trim());
if (occuranceCount > 0)
lblOutput.Text = "<br/><br/><b>Sibeesh Passion </b>Says <br/><br/>The given string pattern <i>" + txtPattern.Value + "</i> Contains " + occuranceCount + " times in <i>"
+ txtInputString.Value + "</i><br/><br/> Thank you for visiting. Please Visit Again!!!";
else
lblOutput.Text = "<br/><br/><b>Sibeesh Passion </b>Says <br/><br/>The given string pattern <i>" + txtPattern.Value + "</i> Is not occured s in <i>"
+ txtInputString.Value + "</i><br/><br/> Thank you for visiting. Please Visit Again!!!";
//End
}
#region FindOccurrences
/// <summary>
/// This method is used to get the Count of Occurrences of a string in a string
/// </summary>
/// <param name="InputString"></param>
/// <param name="patternString"></param>
/// <returns>Int</returns>
public int FindOccurrences(string InputString, string patternString)
{
// Here we are looping through InputString
int intCount = 0;
int i = 0;
while ((i = InputString.IndexOf(patternString, i)) != -1)
{
i += patternString.Length;
intCount++;
}
return intCount;
}
#endregion
}
[/csharp]

Default.aspx

[html]
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Find Occurrence of String,Find String Form String,Regex,String Contains Substring – Sibeesh Passion</title>
<style type="text/css">
textarea {
width: 630px;
height: 100px;
}

table {
border: 1px solid #ccc;
padding: 10px;
width: 800px;
text-align:center;
}

tr {
border: 1px solid #999;
border-radius: 5px;
}

td {
border: 1px solid #999;
padding: 10px;
border-radius: 5px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table >
<tr>
<td>
<asp:Label ID="lblInputString" runat="server" Text="Input String"></asp:Label>
</td>
<td>
<textarea id="txtInputString" runat="server"></textarea>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblPattern" runat="server" Text="Pattern String"></asp:Label>
</td>
<td>
<textarea id="txtPattern" runat="server"></textarea>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnCheckOccurance" runat="server" Text="Check Occurance" OnClick="btnCheckOccurance_Click" />
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblOutput" runat="server" Text="See Output Here!!! <i> Thank you for visiting. Please Visit Again!!! </i>"></asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
[/html]

Validation

Now if you want you can add some basic validation to your code in server side and client side. I will always recommend you to do both validation.

Server Side
[csharp]
if (txtInputString.Value.ToLower().Trim() != "" && txtPattern.Value.ToLower().Trim() != "")
{
}
[/csharp]

Place the button click event code inside of this if condition.

Client Side

Add a Jquery reference

[js]
<script src="jquery-2.0.2.min.js"></script>
[/js]

And add the below scripts.

[js]
<script>
$(document).ready(function () {
$(‘#btnCheckOccurance’).click(function () {
if ($(‘#txtInputString’).val() == "" || $(‘#txtPattern’).val() == "") {
alert(‘Values can not be empty’);
return false;
}
});
});
</script>
[/js]

Conclusion

I hope someone found this article useful. Please share me your valuable thoughts and comments. Your feedback is always welcomed.

Thanks in advance. Happy coding!

Kindest Regards
Sibeesh Venu

Consider following is my string.

[csharp]
String myString = "MyString1";
[/csharp]

And I need to take out the number 1 from the value MyString1. What will we do?

To do this we can use Regex class in C#. Following is the code to achieve the same 🙂

[csharp]
myString = Regex.Replace(sortdatafield, @"[\d-]", string.Empty);
[/csharp]

Once you done and Run, you will get the new value without numbers (“MyString”) in the variable myString

I hope someone found this useful. Happy Coding 🙂

Kindly see my code snippets here

Kindest Regards
Sibeesh Venu

And I need to take out the number 1 from the value MyString1. What will we do?

To do this we can use Regex class in C#. Following is the code to achieve the same 🙂

[csharp]
myString = Regex.Match(myString , @"\d+").Value;
[/csharp]

Once you done and Run, you will get value 1 in the variable myString

I hope someone found this useful. Happy Coding 🙂

Kindest Regards
Sibeesh Venu