extract all email address from a text using c#

user_232687 0
Viewed 56356

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

For example

my email address is mrrame@gmail.com and his email is mrgar@yahoo.com

should return

mrrame@gmail.com, mrgar@yahoo.com

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;
        }
email regex .net c#
5 Answers

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());
    }
}
user_1574050

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());
     }
}
user_2326870

Just remove the "^" from the beginning and the "$" from the end of your filter string.

user_459160
Admin1

If you don't want it to match perfect email addresses, don't use a regular expression that matches perfect email addresses.

The regular expression you are using will match on the start of the line (^) and the end of the line ($), so if you remove those it will not filter with them.

Oded_15830
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