Solved

Named group regular expressions in Powershell

Posted on 2013-01-15
2
927 Views
Last Modified: 2013-01-31
In powershell I am trying to search a file specified by the $mypath variable for a given regular expression pattern $mypattern. The regular expression uses named groups of the form '(?<age>[0-9]*Years)'. How can I get the named group value into a variable that I can use. I have tried the following as a guess but havent got anywhere.

$result = select-string -path $mypath -pattern $mypattern | foreach-object {$_.matches} | foreach-object {$_.groups['age']} | select-object value

Open in new window

0
Comment
Question by:Blowfelt82
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 38778761
try:

select-string -path $mypath -pattern $mypattern | select -expand Matches | foreach {$_.groups["age"].value}

Open in new window

0
 
LVL 70

Accepted Solution

by:
Qlemo earned 500 total points
ID: 38778832
Select-String seems to ignore named captures. The groups are always named like the captured value, which makes it less useful. You will have to use the numeric index into the Groups collection to get access:
select-string -path $mypath -pattern $mypattern |
  select -Expand Matches |
  foreach-object {$_.Groups[1].Value}

Open in new window

0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The following article is intended as a guide to using PowerShell as a more versatile and reliable form of application detection in SCCM.
In previous parts of this Nano Server deployment series, we learned how to create, deploy and configure Nano Server as a Hyper-V host. In this part, we will look for a clustering option. We will create a Hyper-V cluster of 3 Nano Server host nodes w…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question