exclude search pattern with select-string in powershell

Question

I'm using select string to search a file for errors. Is it possible to exclude search patterns as with grep. Ex:

grep ERR* | grep -v "ERR-10"

select-string -path logerror.txt -pattern "ERR"

logerror.txt

OK
ERR-10
OK
OK
ERR-20
OK
OK
ERR-10
ERR-00

I want to get all the ERR lines, but not the ERR-00 and ERR-10

-(not)match should work, you might wanna have a look at the help and/or post a sample of your file — Jaqueline Vanek
– Jaqueline Vanek, Commented Aug 24, 2016 at 15:46

dronik · Accepted Answer · 2017-10-31 18:43:55Z

36

I use "-NotMatch" parameter for this

PS C:\>Get-Content .\some.txt
1
2
3
4
5
PS C:\>Get-Content .\some.txt | Select-String -Pattern "3" -NotMatch    
1
2
4
5

For your case the answer is:

Get-Content .\logerror.txt | Select-String -Pattern "ERR*" | Select-String -Pattern "ERR-[01]0" -NotMatch

answered Oct 31, 2017 at 18:43

dronik

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Comments

Gebb · Accepted Answer · 2016-08-25 14:01:03Z

8

I guess you can use Where-Object here.

Write-Output @"
OK
ERR-10
OK
OK
ERR-20
OK
OK
ERR-10
ERR-00
"@ > "C:\temp\log.txt"

# Option 1.
Get-Content "C:\temp\log.txt" | Where-Object { $_ -Match "ERR*"} | Where-Object { $_ -NotMatch "ERR-[01]0"}

# Option 2.
Get-Content "C:\temp\log.txt" | Where-Object { $_ -Match "ERR*" -and $_ -NotMatch "ERR-[01]0"}

edited Aug 25, 2016 at 14:01

answered Aug 25, 2016 at 13:06

Gebb

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5 Comments

Pedro Sales Over a year ago

Thank you for you answer. I understand what you want to do, but this is just an example. If I have more and more complex error codes (like I do), this doesn't work: Example:ERR-201,ERR-422;ERR-240. I just needed a way to filter the erros, because some are really erros and others are just informations.

Gebb Over a year ago

@PedroSales, You modify the regexp then. The code I've shown is the equivalent of grep -v "ERR-[01]0", i.e. you use a regexp to exclude lines from the output. I guess you already know how to emulate grep without the -v argument.

Pedro Sales Over a year ago

With grep, I just pipe another grep -v with another error code

Gebb Over a year ago

Exactly. Ok, I will modify my answer to match your combination of greps.

Pedro Sales Over a year ago

Thank you so much for your help. I've een around with this for a couple of days now.

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