using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:(?:\d{4}) (?:\d{3}) (?:\d{3})|(?:\d{2}) (?:\d{2}) (?:\d{2})|(?:\d{2}) (?:\d{4}) (?:\d{4})|(?:\d{4}) (?:\d{4}))$";
string input = @"02 1234 5678
0412 345 678
1800 123 456
1300 123 456
13 12 34
1900 123 456
1902 123 456
1234 5678
02 25 45
";
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