using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(^header\d+[\s\S]+?(?=^header|\Z))";
string input = @"# output could containmultiple headers, and lines, or no lines per header this is an example of what could be present but it is not absolute.
header1
-------
line1
line2
line3 # can be muiplies availables or known
header2
-------
line1
line2
line3 # can be muiplies availables or known
header3
-------
header4
-------
line1
line2
line3 # can be multiple linnes or none not known ";
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