i need a good function that will validate an email adress

Question

i need a function that will check whether a string input is a valid email adress or not

thnx a lot

Answer 1

There are several different options depending on the type of email address you are expecting. Check out the following page that shows several different methods: http://www.regular-expressions.info/email.html

---

Windows Live Developer MVP - http://rbrundritt.spaces.live.com

Answer 2

There are several different options depending on the type of email address you are expecting. Check out the following page that shows several different methods: http://www.regular-expressions.info/email.html

---

Windows Live Developer MVP - http://rbrundritt.spaces.live.com

i need one that working with known emails

like gmail hotmail yahoo
and should be strict

Answer 3

Hi,

You could try to use the expression:     ^[A-Z0-9._%+-]+@(gmail|hotmail|yahoo+\.com)$

there is code that runs the expression:

private bool AreEmailAddressesValid(string emailAddressesString)
        {
            string m_Regex = @"^[A-Z0-9._%+-]+@(gmail|hotmail|yahoo+\.com)$";
            string m_Separators = ";";
            System.Text.RegularExpressions.RegexOptions m_Options =
                           System.Text.RegularExpressions.RegexOptions.Multiline | System.Text.RegularExpressions.RegexOptions.IgnoreCase;

            string[] emailAddresses = null;

            if (emailAddressesString.IndexOfAny(m_Separators) != -1)
                emailAddresses = emailAddressesString.Split(m_Separators);
            else
                emailAddresses = new string[] {emailAddressesString};
       
            foreach (string address in emailAddresses)
            {
                System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(m_Regex, m_Options);
                MatchCollection collection = reg.Matches(address.Trim());
                if (collection.Count != 1)
                    return false;
            }

            return true;
}

Regards.

---

Roman, software developer at Coherent Solutions Company.

Answer 4

Hi,

You could try to use the expression:     ^[A-Z0-9._%+-]+@(gmail|hotmail|yahoo+\.com)$

there is code that runs the expression:

private bool AreEmailAddressesValid(string emailAddressesString)
        {
            string m_Regex = @"^[A-Z0-9._%+-]+@(gmail|hotmail|yahoo+\.com)$";
            string m_Separators = ";";
            System.Text.RegularExpressions.RegexOptions m_Options =
                           System.Text.RegularExpressions.RegexOptions.Multiline | System.Text.RegularExpressions.RegexOptions.IgnoreCase;

            string[] emailAddresses = null;

            if (emailAddressesString.IndexOfAny(m_Separators) != -1)
                emailAddresses = emailAddressesString.Split(m_Separators);
            else
                emailAddresses = new string[] {emailAddressesString};
       
            foreach (string address in emailAddresses)
            {
                System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(m_Regex, m_Options);
                MatchCollection collection = reg.Matches(address.Trim());
                if (collection.Count != 1)
                    return false;
            }

            return true;
}

Regards.

---

Roman, software developer at Coherent Solutions Company.

thanks for the help.I hope this is going to help my purpose

---

faa practice test

Answer 5

There is actually a sticky post on this forum for this topic as it is such a common (and yet so difficult) task: http://social.msdn.microsoft.com/Forums/en-US/regexp/thread/8cefc911-e1dd-486e-aab1-e5835f417a39.