Matching IP Address using the Regular Expression
This example demonstrates the quick and simple way to match correct IP address.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
namespace MatchesDemo
{
public partial class IPValidate : Form
{
public IPValidate()
{
InitializeComponent();
}
private void btnValidate_Click(object sender, EventArgs e)
{
// MessageBox.Show(mtxtIPAddress.Text);
// create a regex object
Regex checkIP = new Regex (@"\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b");
// create match
Match matchIP = checkIP.Match(mtxtIPAddress.Text);
if (checkIP.IsMatch(mtxtIPAddress.Text))
{
mtxtIPAddress.ForeColor = Color.Green;
}
else
mtxtIPAddress.ForeColor = Color.Red;
}
}
}
