using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(\([0-9]{2}\)\s?[0-9]{4,5}-?[0-9]{3,4})|([0-9]{10,11})|([0-9]{2}\s?[0-9]{8,9})";
string input = @"(99) 99999-9999
(99)99999-9999
(99)9999-9999
(99)99999-999
99 999999999
99 99999999
99999999999
9999999999
";
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