Extract matched data using regular expressions C# example

This example will help you understand how to extract matched data using regular expressions and display it on the console.
Watch this tutorial first on using BackReferences:




using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Text.RegularExpressions;

namespace Regex1
{
    class Program
    {
        static void Main(string[] args)
        {
            string htmlfile = CreateString();
            DisplayMatches(htmlfile);
            Console.ReadKey();

        }
        static string CreateString()
        {
            FileStream fs = new FileStream(@"C:\Users\Ship\Documents\Visual Studio 2008\Projects\Regex1\Regex1\Sample.aspx", FileMode.Open);

            StreamReader sr = new StreamReader(fs);

            string s = sr.ReadToEnd();

            return s;

        }

        static void DisplayMatches(string s)
        {
            Regex r;
            Match m;
            r = new Regex(@"href\s*=\s*(?:""(?<1>[^""]*)""|(?<1>\S+))", RegexOptions.IgnoreCase|RegexOptions.Compiled);
            for (m = r.Match(s); m.Success; m = m.NextMatch())
            {
                Console.WriteLine("Found href " + m.Groups[1] + " at "
                + m.Groups[1].Index);
            }
        }
    }
}


Video tutorial for this post will be uploaded soon.

Regards
Sameer Shaik


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