.net - 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());
    }
}