using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?=[A-Za-z0-9][A-Za-z0-9@._%+-]{5,253}$)[A-Za-z0-9._%+-]{1,64}@(?:(?=[A-Za-z0-9-]{1,63}\.)[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*\.){1,8}[A-Za-z]{2,63}$";
string input = @"Format: minimum 2 characters @ minimum 3 characters . 2 - 63 characters
the g modifier let's us match multiple times in one string. the m modifier is useful here because it lets us treat each line as a seperate entry. Though in practice you probably dont need it for a simple one line email field
^(?=[A-Z0-9][A-Z0-9@._%+-]{5,253}+$)[A-Z0-9._%+-]{1,64}+@(?:(?=[A-Z0-9-]{1,63}+\.)[A-Z0-9]++(?:-[A-Z0-9]++)*+\.){1,8}+[A-Z]{2,63}+$
שדגכ@שדגכ
דגכ
אלפ@גכדץ.בםצ
Jim@stuff.co.uk
Jim@google.com
Henry@h.com
Joe @m.net
Joe@m.net
Joe@mo.net
Joe@sam.net
a@sam.net
mo@sam.org
12@sam.org
Jon@sam.c
Jon@sam.co
";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx