extract all email address from a text using c#

Question

Is there a way to extract all email addresses from a plain text using C# .

For example

my email address is [email protected] and his email is [email protected]

should return

[email protected], [email protected]

I have tried the following but it matches perfect emails only.

 public const string MatchEmailPattern =             @"^(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"             + @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."               + @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"             + @"([a-zA-Z]+[\w-]+\.)+[a-zA-Z]{2,4})$";           public static bool IsEmail(string email)         {             if (email != null) return Regex.IsMatch(email, MatchEmailPattern);             else return false;         } 

Answer 1

check this snippet

using System.IO; using System.Text.RegularExpressions; using System.Text;  class MailExtracter {      public static void ExtractEmails(string inFilePath, string outFilePath)     {         string data = File.ReadAllText(inFilePath); //read File          //instantiate with this pattern          Regex emailRegex = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*",             RegexOptions.IgnoreCase);         //find items that matches with our pattern         MatchCollection emailMatches = emailRegex.Matches(data);          StringBuilder sb = new StringBuilder();          foreach (Match emailMatch in emailMatches)         {             sb.AppendLine(emailMatch.Value);         }         //store to file         File.WriteAllText(outFilePath, sb.ToString());     } } 

Answer 2

Following works

public static void emas(string text) {     const string MatchEmailPattern =       @"(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"       + @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."       + @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"       + @"([a-zA-Z]+[\w-]+\.)+[a-zA-Z]{2,4})";       Regex rx = new Regex(        MatchEmailPattern,        RegexOptions.Compiled | RegexOptions.IgnoreCase);       // Find matches.       MatchCollection matches = rx.Matches(text);       // Report the number of matches found.      int noOfMatches = matches.Count;       // Report on each match.      foreach (Match match in matches)      {        Console.WriteLine(match.Value.ToString());      } }