using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?P<ip>\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}) - - \[(?P<date>.*)\] ""(?P<request>.*?)"" (?P<status>\d*) (?P<size>\d*) ""(?P<referer>.*?)"" ""(?P<user_agent>.*?)"".*$";
string input = @"192.0.102.40 - - [09/Apr/2018:06:26:33 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:26:33 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
198.199.64.224 - - [09/Apr/2018:06:26:33 -0400] ""POST /blog/wp-cron.php?doing_wp_cron=1523269593.5797910690307617187500 HTTP/1.1"" 499 0 ""-"" ""WordPress/4.9.5; https://ivoah.net/blog""
192.0.102.40 - - [09/Apr/2018:06:26:33 -0400] ""HEAD /blog/ HTTP/1.1"" 200 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:31:32 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:31:32 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
198.199.64.224 - - [09/Apr/2018:06:31:33 -0400] ""POST /blog/wp-cron.php?doing_wp_cron=1523269893.1204290390014648437500 HTTP/1.1"" 499 0 ""-"" ""WordPress/4.9.5; https://ivoah.net/blog""
192.0.102.40 - - [09/Apr/2018:06:31:33 -0400] ""HEAD /blog/ HTTP/1.1"" 200 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:36:39 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:36:39 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
198.199.64.224 - - [09/Apr/2018:06:36:39 -0400] ""POST /blog/wp-cron.php?doing_wp_cron=1523270199.4308791160583496093750 HTTP/1.1"" 499 0 ""-"" ""WordPress/4.9.5; https://ivoah.net/blog""
192.0.102.40 - - [09/Apr/2018:06:36:39 -0400] ""HEAD /blog/ HTTP/1.1"" 200 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
47.52.68.60 - - [09/Apr/2018:06:37:08 -0400] ""POST /blog/2016/05/13/mate-on-raspberry-pi/?share=email&nb=1 HTTP/1.1"" 302 5 ""https://ivoah.net/blog/2016/05/13/mate-on-raspberry-pi/?share=email&nb=1"" ""Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2)""
47.52.68.60 - - [09/Apr/2018:06:37:09 -0400] ""GET /blog/2016/05/13/mate-on-raspberry-pi/?shared=email HTTP/1.1"" 200 30602 ""https://ivoah.net/blog/2016/05/13/mate-on-raspberry-pi/?share=email&nb=1"" ""Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2)""
94.23.33.67 - - [09/Apr/2018:06:37:43 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 301 184 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
94.23.33.67 - - [09/Apr/2018:06:37:43 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 301 184 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
94.23.33.67 - - [09/Apr/2018:06:37:44 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 404 570 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
94.23.33.67 - - [09/Apr/2018:06:37:44 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 301 184 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
94.23.33.67 - - [09/Apr/2018:06:37:45 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 301 184 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
94.23.33.67 - - [09/Apr/2018:06:37:45 -0400] ""GET //wp-content/plugins/cherry-plugin/admin/css/cherry-admin-plugin.css HTTP/1.0"" 404 570 ""-"" ""Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36""
192.0.102.40 - - [09/Apr/2018:06:41:44 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
192.0.102.40 - - [09/Apr/2018:06:41:44 -0400] ""HEAD /blog HTTP/1.1"" 301 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
198.199.64.224 - - [09/Apr/2018:06:41:44 -0400] ""POST /blog/wp-cron.php?doing_wp_cron=1523270504.8351509571075439453125 HTTP/1.1"" 499 0 ""-"" ""WordPress/4.9.5; https://ivoah.net/blog""
192.0.102.40 - - [09/Apr/2018:06:41:44 -0400] ""HEAD /blog/ HTTP/1.1"" 200 0 ""-"" ""jetmon/1.0 (Jetpack Site Uptime Monitor by WordPress.com)""
207.244.149.74 - - [09/Apr/2018:06:45:38 -0400] ""GET /wp-content/plugins/wp-formgenerator/assets/js/simpleslider.js HTTP/1.1"" 404 341 ""https://ivoah.net/wp-content/plugins/wp-formgenerator/assets/js/simpleslider.js"" ""Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36""
54.36.148.188 - - [09/Apr/2018:06:45:44 -0400] ""GET /wp/audio/05042011.m4a HTTP/1.1"" 301 184 ""-"" ""Mozilla/5.0 (compatible; AhrefsBot/5.2; +http://ahrefs.com/robot/)""
";
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