using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^\.?\d{1,5}(?:\.\d{1,5})*$";
string input = @"1
12
123
1234
12345
123456
1.2
.1
.1.2
1234567890
1234567890.
12345.67890
.1234567890
123.4567.890
.1234567890.
12345..67890
.1234.567890.
1.234.567.890
.123.456.7890
.1.2.3.4.5.6.7.8.9.0
.1.2.3.4.5.6.7.8.9.0.";
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