using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:[^%\d]|^|\b(?=%))(?:%%)*(\d+)";
string input = @"abcd %1 %%2 %%%3 %%%%4 efgh
abcd%12%%34%%%666%%%%11efgh
%%6%%7%%8
123
abc123";
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