Regular Expression To Strip/Remove Html Tags From String in ASP.Net C#.Net VB.Net

In this tutorial i am going to explain about how to strip/remove html tags from the string using regular expression in asp.net and C#.Net or It is achieved by using the System.Text.RegularExpressions namespace.


In my previous article i have explained about Sort Dictionary Based On Value In Asp.Net , Get All Coutries From System.Globalization Namespace , Web Api Model Validation Using Validation Filters , Convert String To Upper,Lower & Title(Proper) Case Using TextInfo Class Build Products Comparision Table/Grid In ASP.Net , Store Custom Objects In Configuration File and many articles in ASP.Net,C#.Net,VB.Net,Grid View,Javascript,jQuery,SQL Server and many other topics.

In this tutorial for explaining purpose i have a textbox to get the html string as input and a button control. While clicking on the button it will strip the html and output the plain text in the next textbox. Below i have mentioned the entire code.

HTML Markup:

<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” ValidateRequest=”false” %>
<!DOCTYPE html>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head runat=”server”>
    <title></title>
</head>
<body>
<form id=”form1″ runat=”server”>
<div>
    <h2>Regular Expression Code to Remove HTML tags in C# </h2>
    <table>
        <tr>
            <td>Input Html</td>
            <td>
                <asp:TextBox ID=”txtHtml” runat=”server” TextMode=”MultiLine”>
                </asp:TextBox>
            </td>
        </tr>
        <tr>
            <td colspan=”2″>
                <asp:Button ID=”btnStripHtml” runat=”server” OnClick=”btnStripHtml_Click”
                    Text=”Strip Html” />
            </td>
        </tr>
        <tr>
            <td>Plain Text</td>
            <td>
                <asp:TextBox ID=”txtPlainText” runat=”server” TextMode=”MultiLine”>
                </asp:TextBox>
            </td>
        </tr>
    </table>
</div>
</form>
</body>
</html>

Below is the cs code.

C#.Net:

using System;
usingSystem.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
usingSystem.Web.UI.WebControls;
// Include this if it is not already there
usingSystem.Text.RegularExpressions;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    // Method to strip HTML Tags
    public string StripHtmlTags(string source)
    {
        return Regex.Replace(source, “<.*?>|&.*?;”, string.Empty);
    }
    protected void btnStripHtml_Click(object sender, EventArgs e)
    {
        // Getting Input HTML
        string inputHtml = txtHtml.Text;
        // Removing HTML tags including &nbsp; from the input
        string outputText = StripHtmlTags(inputHtml);
        // Assigning plain text output to output textbox
        txtPlainText.Text = outputText;
    }
}

VB.Net:

ImportsSystem.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
ImportsSystem.Web.UI.WebControls
‘ Include this if it is not already there
ImportsSystem.Text.RegularExpressions
Partial Public Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(sender As Object, e As EventArgs)
    End Sub
    ‘ Method to strip HTML Tags
    Public FunctionStripHtmlTags(source As String) As String
        Return Regex.Replace(source, “<.*?>|&.*?;”, String.Empty)
    End Function
    Protected Sub btnStripHtml_Click(sender As Object, e As EventArgs)
        ‘ Getting Input HTML
        Dim inputHtml As String = txtHtml.Text
        ‘ Removing HTML tags including &nbsp; from the input
        Dim outputText As String = StripHtmlTags(inputHtml)
        ‘ Assigning plain text output to output textbox
        txtPlainText.Text = outputText
    End Sub
End Class

If you run the application then you will get the below output.

Output of Regular Expression To Strip/Remove Html Tags From String in ASP.Net C#.Net VB.Net

SourceCode:

Source code of Regular Expression To Strip/Remove Html Tags From String in ASP.Net C#.Net VB.Net

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