How to get the captured groups from Select-String?
Have a look at the following
$a = "http://192.168.3.114:8080/compierews/" | Select-String -Pattern '^http://(.*):8080/(.*)/$'
$a
is now a MatchInfo
($a.gettype()
) it contain a Matches
property.
PS ps:\> $a.Matches
Groups : {http://192.168.3.114:8080/compierews/, 192.168.3.114, compierews}
Success : True
Captures : {http://192.168.3.114:8080/compierews/}
Index : 0
Length : 37
Value : http://192.168.3.114:8080/compierews/
in the groups member you'll find what you are looking for so you can write :
"http://192.168.3.114:8080/compierews/" | Select-String -Pattern '^http://(.*):8080/(.*)/$' | % {"IP is $($_.matches.groups[1]) and path is $($_.matches.groups[2])"}
IP is 192.168.3.114 and path is compierews
This worked for my situation.
Using the file: test.txt
// autogenerated by script
char VERSION[21] = "ABCDEFGHIJKLMNOPQRST";
char NUMBER[16] = "123456789012345";
Get the NUMBER and VERSION from the file.
PS C:\> Select-String -Path test.txt -Pattern 'VERSION\[\d+\]\s=\s\"(.*)\"' | %{$_.Matches.Groups[
1].value}
ABCDEFGHIJKLMNOPQRST
PS C:\> Select-String -Path test.txt -Pattern 'NUMBER\[\d+\]\s=\s\"(.*)\"' | %{$_.Matches.Groups[1
].value}
123456789012345
According to the powershell docs on Regular Expressions > Groups, Captures, and Substitutions:
When using the -match
operator, powershell will create an automatic variable named $Matches
PS> "The last logged on user was CONTOSO\jsmith" -match "(.+was )(.+)"
The value returned from this expression is just true
|false
, but PS will add the $Matches
hashtable
So if you output $Matches
, you'll get all capture groups:
PS> $Matches
Name Value
---- -----
2 CONTOSO\jsmith
1 The last logged on user was
0 The last logged on user was CONTOSO\jsmith
And you can access each capture group individually with dot notation like this:
PS> "The last logged on user was CONTOSO\jsmith" -match "(.+was )(.+)"
PS> $Matches.2
CONTOSO\jsmith
Additional Resources:
- To Get Multiple Matches, see How to capture multiple regex matches
- To Pass Options/Flags, see Pass regex options to PowerShell
[regex]
type