How to extract matched data from a source and replace substrings using regular expressions

In this tutorial we will detect a specific pattern from given source file and edit the source file automatically with our custom format substring pattern

Video Part - 1



Video Part - 2

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.IO;

using System.Threading;

using System.Security.Permissions;

using System.Text.RegularExpressions;

namespace Example1

{

    class Program

    {

        static void Main(string[] args)

        {

            string SampleText = CreateString();

            DisplayMatches(SampleText);

            Console.WriteLine("We will now replace the dates with our custom format to the file");

            string ChangedText = ReplaceString(SampleText);

            WriteToFile(ChangedText);

            Console.ReadKey();

           

        }

        static string CreateString()

        {

            FileStream fs = new FileStream(@"C:\My stuff\Work Stuff\Blog\Test\SampleText.txt", FileMode.Open);

            StreamReader sr = new StreamReader(fs);

           

            string s = sr.ReadToEnd();

            sr.Close();

            fs.Close();

            return s;

           

        }

        static void DisplayMatches(string s)

        {

           

            Regex r;

            Match m;

r = new

              

            for (m = r.Match(s); m.Success; m = m.NextMatch())

            {

                Console.WriteLine("Found a date in the source"

                + " "+ m.Result("${day}/${month}/${year}"));

            }

        }

        static string ReplaceString(string s)

        {

         

       

        }

        static void WriteToFile(string s)

        {

            FileStream fs = new FileStream(@"C:\My stuff\Work Stuff\Blog\Test\SampleText.txt", FileMode.Open,FileAccess.Write);

            StreamWriter sw = new StreamWriter(fs);

            sw.Write(s);

            sw.Close();

            fs.Close();

            

        }

      

    }

}

Regards
Sameer Shaik

Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test