using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(\d{4}(?:-\d{2}){2}\s\d{2}(?::\d{2}){2})(,\d+[^\]]+\])\s(INFO|ERROR)\s([\S\s]+?)(?=\r?\n\d{4}(?:-\d{2}){2}|$)";
string input = @"2018-01-09 04:50:25,226 [18] INFO messages starts here line1
line2 above error continued in next line
2018-01-09 04:50:29,226 [18] ERROR messages starts here line1
line2 above error continued in next line
line2 above error continued in next line
line2 above error continued in next line
2018-01-09 05:50:29,226 [18] ERROR messages starts here line1
line2 above error continued in next line";
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