Grok Stops Reading at a Backslash?

This is an extension to a previously solved topic.

I have this log here (as it appears in the console)

2019-08-05 08:55:15 - jcramer(Software Programmer) - Successfully updated profile

that I've successfully been able to parse with this Grok configuration,

grok { 
    match => { "message" => "^%{TIMESTAMP_ISO8601:syslog_timestamp} - 
    %{GREEDYDATA:syslog_message}" } 

however, I receive a _grokparsefailure when the username appears like this in the console:

2019-08-05 08:55:15 - STEM\\psmith(Hardware Engineer) - Successfully updated profile

The acronym before the username is meant to represent something like a department or location. Somehow the inclusion of the backslash causes Grok to not recognize the pattern. I would like to parse the username so that the backslash and information prior to it are included in the username.

So, the end result can look like this

"syslog_username" => "jcramer"

or this

"syslog_username" => "STEM\\psmith"

Use a custom pattern with the first part optional


Unfortunately that didn't seem to work. The pattern successfully parses in the first example without the backslashes and acronym. I've been trying to keep the log example simple, but I should provide a more accurate format to what I'm parsing:

2019-08-05 08:55:15 - ITD\\psmith(Hardware Engineer)[ECS project update, Standard user] - Successfully updated user information

In the browser, the log appears like this (with one backslash):

2019-08-05 08:55:15 - ITD\psmith(Hardware Engineer)[ECS project update, Standard user] - Successfully updated user information

So the end goal is to parse the fields like so:

"syslog_timestamp" => "2019-08-05 08:55:15"
"syslog_username" => "ITD\\psmith"
"syslog_userinfo" => "Hardware Engineer"
"structured_data" => "ECS project update, Standard user"
"syslog_message" => "Successfully updated user information"

How should I adjust the Grok pattern to include what you've suggested for this log format?

I didn't realize the backslash was escaped, I thought you meant double backslash, so I had four backslashes in my grok pattern. To match a single backslash reduce that to two.

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Wow, that worked! I also forgot to include whitespace after the dash, before the username pattern. Fixing both did the trick.

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