using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:(?=.{1,10}$)\d{1,3}(?:,\d{3})+|(?=.{1,8}$)\d+)$";
string input = @"20
3000
4,000
600000
7,000,000
8000000
7,00
9,99
9,999
6,000,000
987654
2000,000
99999999
999999999
99,999,999
999,999,999";
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