I am using regex to parse nginx logs.
One of the fields I'm creating is 'message'. Sometimes this group will contain a JSON string.
How can I optionally match within my 'message' group to create a 'json' group?
Here's my current regex:
(?<time>\d{4}\/\d{2}\/\d{2} \d{2}:\d{2}:\d{2}) \[(?<log_level>\w+)\] (?<pid>\d+).(?<tid>\d+): (?<message>.*)
Here's an example message:
2017/12/02 12:45:40 [debug] 29#29: *7895 [lua] auth_client.lua:41: {"applicationName":"nginx", "applicationFunction":"auth-client" ,"logLevel": "DEBUG", "clientId":"xyz","requestId":"72e03798e9826f2c4b076e3779903edf","message":"Checking client credentials"}
With my current regex I get a field like:
message: *7895 [lua] auth_client.lua:41: {"applicationName":"nginx-auth-filter", "applicationFunction":"auth-client" ,"logLevel": "DEBUG", "clientId":"ifly","requestId":"72e03798e9826f2c4b076e3779903edf","message":"Checking client credentials"}
What I would like is:
message: *7895 [lua] auth_client.lua:41: {"applicationName":"nginx-auth-filter", "applicationFunction":"auth-client" ,"logLevel": "DEBUG", "clientId":"ifly","requestId":"72e03798e9826f2c4b076e3779903edf","message":"Checking client credentials"}
json: {"applicationName":"nginx-auth-filter", "applicationFunction":"auth-client" ,"logLevel": "DEBUG", "clientId":"ifly","requestId":"72e03798e9826f2c4b076e3779903edf","message":"Checking client credentials"}
However, sometimes message doesn't contain json so the group should be optional.
You can use this regex with an optional group for json string:
(?<time>\d{4}\/\d{2}\/\d{2} \d{2}:\d{2}:\d{2}) \[(?<log_level>\w+)\] (?<pid>\d+).(?<tid>\d+): (?<message>[^{]*(?<json>\{.*\})?.*)
This is assuming json text starts with first { and ends with last } in the message group.
RegEx Demo
Related
I want to use the following filter pattern - "error-res-received ". So on the configuration yaml file, I have have given FilterPattern: "\"error-res-received \"". But after deploying the lambda with subscription filter, When I check it on cloud watch > log group > subscription filters, the filter pattern is as error-res-received(double quotes are missing). So now, it's only picking up the logs which has word only error in it and excluding the words res and received. How can solve this issue? I need the logs which match this sentence "error-res-received".
To Match exact phrases
The following code snippet shows an example of a filter pattern that returns log events where messages contain the exact phrase INTERNAL SERVER ERROR.
"INTERNAL SERVER ERROR"
The filter pattern returns the following log event message:
[ERROR 500] INTERNAL SERVER ERROR
To Match everything
You can match everything in your log events with double quotation marks. The following code snippet shows an example of a filter pattern that returns all log events.
" "
In your case, "error-res-received ", there is extra space at end which might make it to match everything.
I have a string in Powershell which contains the following data
An account failed to log on.
Subject:
Security ID: S-1-5-18
Account Name: TEX
Account Domain: TD2
Logon ID: 0x3E7
Logon Type: 8
Account For Which Logon Failed:
Security ID: S-1-0-0
Account Name: test_mathysf
Account Domain: tdlz2
Failure Information:
Failure Reason: Unknown user name or bad password.
Status: 0xC000006D
Sub Status: 0xC000006A
Process Information:
Caller Process ID: 0x4f80
Caller Process Name: C:\Windows\System32\inetsrv\w3wp.exe
Network Information:
Workstation Name: T22
Source Network Address: 192.168.10.28
Source Port: 45221
Detailed Authentication Information:
Logon Process: Advapi
Authentication Package: Negotiate
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Ser
ver service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be l
eft blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
I wanted to escape everything between Subject and Key Lenght with the following regex Pattern.
$pattern = "(?<=.*Subject:)\w+?(?=Length:*)"
The result of the regex should be like that
Subject:
Security ID: S-1-5-18
Account Name: TEX
Account Domain: TD2
Logon ID: 0x3E7
Logon Type: 8
Account For Which Logon Failed:
Security ID: S-1-0-0
Account Name: test_mathysf
Account Domain: tdlz2
Failure Information:
Failure Reason: Unknown user name or bad password.
Status: 0xC000006D
Sub Status: 0xC000006A
Process Information:
Caller Process ID: 0x4f80
Caller Process Name: C:\Windows\System32\inetsrv\w3wp.exe
Network Information:
Workstation Name: T22
Source Network Address: 192.168.10.28
Source Port: 45221
Detailed Authentication Information:
Logon Process: Advapi
Authentication Package: Negotiate
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
But in my project, the regex doesn't work. (it doesn't get a match)
After that I would use the ConvertFrom-StringData cmdlet to create a hash table with the entries (For examle Security ID --> Key = S-1-5-18)
Have somebody an idea where the problem could be?
You seem to want to extract the structured information from the event text.
Here is what I would do.
function ExtractEventData {
param(
[string]$EventText
)
$pattern = [regex]"(?m)^(.*):\s*(^ \S.*:.*\n)+"
$result = #{}
foreach ($match in $pattern.Matches($EventText)) {
$section_name = $match.Groups[1].Value
$result[$section_name] = #{}
foreach ($line in $match.Groups[2].Captures) {
$key, $value = $line.Value.Split(':'.ToCharArray(), 2)
$result[$section_name][$key.Trim()] = $value.Trim()
}
$result[$section_name] = [pscustomobject]$result[$section_name]
}
[pscustomobject]$result
}
When you call it like this with your sample string above
$result = ExtractEventData -EventText $sampleEvent
it produces this data structure:
Process Information : #{Caller Process ID=0x4f80; Caller Process Name=C:\Windows\System32\inetsrv\w3wp.exe}
Detailed Authentication Information : #{Key Length=0; Logon Process=Advapi; Package Name (NTLM only)=-; Authentication Package=Negotiate; Transited Services=-}
Subject : #{Account Domain=TD2; Security ID=S-1-5-18; Account Name=TEX; Logon ID=0x3E7}
Account For Which Logon Failed : #{Account Domain=tdlz2; Security ID=S-1-0-0; Account Name=test_mathysf}
Failure Information : #{Status=0xC000006D; Failure Reason=Unknown user name or bad password.; Sub Status=0xC000006A}
Network Information : #{Workstation Name=T22; Source Network Address=192.168.10.28; Source Port=45221}
Which you can access directly, e.g.
$result.'Network Information'.'Workstation Name' # => T22
The regex is
(?m) # multiline mode
^ # start of line
(.*):\s* # anything (e.g. 'Network Information' into group 1), a colon, whitespace
( # group 2 (e.g. ' Workstation Name: T22')
^ \S.*:.*\n # start of line, 4 spaces, a non-space, a colon, anything, newline
)+ # end group 2, repeat
This way, each section gets handled individually, and within each section, each line.
This is the Message property you got from Get-WinEvent, which is a multiline string with LOCALIZED properties.
Instead of converting that string into an array of objects, better use the event XML notation where you can get universally named properties.
Something like this:
$filter = #{LogName='Security';ProviderName='Microsoft-Windows-Security-Auditing';ID=4625 }
$result = Get-WinEvent -FilterHashtable $filter -ComputerName SECRETSERVER | ForEach-Object {
# convert the event to XML and grab the Event node
$eventXml = ([xml]$_.ToXml()).Event
# output the properties you need in your output
[PSCustomObject]#{
Time = [DateTime]$eventXml.System.TimeCreated.SystemTime
UserName = ($eventXml.EventData.Data | Where-Object { $_.Name -eq 'TargetUserName' }).'#text'
UserSID = ($eventXml.EventData.Data | Where-Object { $_.Name -eq 'TargetUserSid' }).'#text'
Computer = ($eventXml.EventData.Data | Where-Object { $_.Name -eq 'WorkstationName' }).'#text'
}
}
# output on screen
$result | Format-Table -AutoSize
# output to CSV file
$result | Export-Csv -Path 'X:\FailedLogons.csv' -NoTypeInformation
Here you can see all properties the XML would contain for event 4625. The example above just lists the time the logon failure happened, the computer on which that attempt was made and the user name that failed to log in.
You can use
(?ms)^Subject:.*?Length:(?-s).*
See the regex demo.
Regex details:
(?ms) - inline modifiers, m makes ^ match start of any line and $ match any line end position, and s makes . match any chars including LF chars
^ - start of a line
Subject: - a literal text
.*? - any zero or more chars as few as possible
Length: - a literal text
(?-s) - now, . cannot match LF chars any longer
.* - any zero or more chars other than a newline (LF) char, as many as possible.
How to extract the ID of the first object from the response? I am getting the below response of the API.
{"data":[{"id":1,"description":"Test description 1", "Location": "test location 1"}, {"id":2,"description":"Test description 2", "Location": "test location 2"}, {"id":3,"description":"Test description 3", "Location": "test location 3"}]}
I want to extract the id= 1, from the above response. I have tried with {"id":(.+?), regular expression. But I am getting randomly any of the id. What is the regular expression to get the first id from the response?
To get what you want (bad idea):
Regex:
"id":(\d+),.*
Get the result with \1.
Test here.
To get what you need: use a proper json parser. Regexes are not suitable for handling complex stuff (also including HTML among many others).
Use JSON Extractor instead of Regular expression extractor for the JSON response.
To extract the first id from the response you mentioned, use JSON path expressions as : .data[0].id
Example Screenshots:
Now, you can pass the variable test to your next API request as ${test}
I need some help with regex which I am still trying to teach myself. I have beaten my head on this for hours. I am trying to filter logon events in my event log via a syslog server. I would like to only capture actual user logons not all the other stuff coming through.
Computer and user accounts are on the line that says "ACCOUNT NAME:". The computer accounts contain a $ appended to the end of their name and I need to filter those out while accepting the ones without the $ on the end.
The log comes through like this:
Logon Type: 3
Impersonation Level: Impersonation
New Logon:
Security ID: S-1-5-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Account Name: COMPUTERNAME$
Account Domain:(random whitespace) DomainName
Logon ID: 0xXXXXXXXXX
Logon GUID: {XXXXXXXXXXXXX}
Process Information:
Process ID: 0x0
Process Name: -
Network Information:
Workstation Name: -
Source Network Address: 192.168.0.x
Source Port: 000000
Any regex pro that can assist? Thanks
I'm not a regex pro, but I can help you with this specific problem. Use a look ahead to filter the dollar sign off, like this:
(?!.*\$)
This is called a negative look ahead '(?!' and it looks for any char any number of times '.*' UNTIL there's a '$' sign. If a dollar sign is found, no match.
Note that the dollar sign is escaped in the regex.
Edit:
To match account name and not dollar sign, it becomes (assuming account names doesn't contain Spaces):
(?!.*\$)Account Name:\s*(\w+)
Now grap the account in Group 1.
try this:
Account Name:\s*([^\s\$]+[^\s\$]$)
https://regex101.com/r/0W8xVg/3
I am using Jmeter 2.11 and My http response after login as follows,
"apiResponseStatus": "SUCCESS",
"authToken": "o5SsJF9yOebRC9LsR5WCnYUNpslddO30Db/zBAdhBW/ISfL62CaOHqmSkrAHZ8RT4XF6yaGxX6kbmpACZu212Q=="
How to write RegEx for this to reuse same token throughout the Test Plan?
Use Regular Expression Extractor with below details:
Apply to --> Main Sample Only
Response Field to check --> Body
Reference Name: auth_token
Regular Expression: .authToken": "(.+?)".
Template: $1$
Match No.: 1
Default Value: Not Found
You can pass Reference Name as ${auth_token} where it is required throughout your test plan.
Hope this will help.