using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(hello.*?)(?=hello|\z)";
string input = @"hello i am xyz lol hello i
am abc ..;sda<>
hello
i am pqr ahe kiop hello
abc axyz
no
yes
hepdd
jol
hello
podjkd
dasfh";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase | RegexOptions.Singleline;
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