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 How to use Regex using ASP.NET 2.0 and C#.NET

This tutorial will show you how to Repeater pagesetting using ASP.NET 2.0 and C# This tutorial will show you how to Repeater pagesetting using ASP.NET 2.0 and C#.NET .First, you  need to import the  System.Text.RegularExpressions namespace..
using System.Text.RegularExpressions;

We use the Button1_Click to do work.

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The Regex class contains several static methods that allow you to use a regular expression without explicitly creating a Regex object. Using a static method is equivalent to constructing a Regex object, using it once and then destroying it. The Regex class is immutable (read-only) and is inherently thread safe. Regex objects can be created on any thread and shared between threads. The Methods of the Replace is Overloaded. Within a specified input string, replaces strings that match a regular expression pattern with a specified replacement string.

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

}

protected void Button1_Click(object sender, EventArgs e)
{
Label2.Text = InputText(TextBox1.Text, TextBox1.Text.Length);
}

private string InputText(string text, int maxLength)
{
text = text.Trim();
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
if (text.Length > maxLength)
{
text = text.Substring(0, maxLength);
}
text = Regex.Replace(text, "[\\s]{2,}", " ");
text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n");
text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+"," ");
text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty);
text = text.Replace("'", "''");
return text;
}
}

The front end Default.aspx page looks something like this:

<asp:Label ID="Label1" runat="server" Text="Please Input:" Width="91px"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" Width="61px" />
<br />
<br />
<asp:Label ID="Label2" runat="server" Width="254px"></asp:Label></fieldset>
<br />
<br />

We are using Server Intellect and have found that by far, they are the most friendly, responsive, and knowledgeable support team we've ever dealt with!


The flow for the code behind page is as follows.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;

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

}

protected void Button1_Click(object sender, EventArgs e)
{
Label2.Text = InputText(TextBox1.Text, TextBox1.Text.Length);
}

private string InputText(string text, int maxLength)
{
text = text.Trim();
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
if (text.Length > maxLength)
{
text = text.Substring(0, maxLength);
}
text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n");
text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+"," ");
text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty);
text = text.Replace("'", "''");
return text;
}
}




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