using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\b\d{3}[-]?\d{3}[-]?\d{4}|\d{2}[-]?\d{3}[-]?\d{4}|\d{1}[-]?\d{3}[-]?\d{6}|\d{1}[-]?\d{3}[-]?\d{2}[-]?\d{2}[-]?\d{2}|\*{1}?\d{2,5}\b";
string input = @"123-456-7899 123456789 03-123-4567 03-1234567 1-800-123456
1800-123456
1-800-12-34-56 0544-123456 *12 *123 *1234 *12345";
foreach (Match m in Regex.Matches(input, pattern))
{
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