Powershell Regex Grouping from Select-String

Question

I am scraping a web request response to pull information held within html code which repeats a few times so using select-string rather than match. My code looks like

$regexname = '\(\w{0,11}).{1,10}\'
$energenie.RawContent | select-string $regexname -AllMatches | % {$_.matches}

The return looks something like:

Groups : {<h2 class="ener">TV </h2>, TV}
Success : True
Captures : {<h2 class="ener">TV </h2>}
Index : 1822
Length : 33
Value : <h2 class="ener">TV </h2>

Groups : {<h2 class="ener">PS3 </h2>, PS3}
Success : True
Captures : {<h2 class="ener">PS3 </h2>}
Index : 1864
Length : 33
Value : <h2 class="ener">PS3 </h2>

I can't workout a way to grab the second element of groups e.g. TV or PS3 as:

$energenie.RawContent | select-string $regexname -AllMatches | % {$_.matches.groups}

Gives a strange output

Paul

Mathias R. Jessen · Accepted Answer · 2015-10-25 17:07:38Z

1

To get the second item in a collection, use the array index operator: [n] where n is the index from which you want a value.

For each entry in Matches, you want the second entry in the Groups property so that would be:

$MyMatches = $energenie.RawContent | select-string $regexname -AllMatches | % {$_.Matches}
$SecondGroups = $MyMatches | % {$_.Groups[1]}

To get just the captured value, use the Value property:

$MyMatches | % { $_.Groups[1].Value }

answered Oct 25, 2015 at 17:07

Mathias R. Jessen

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3 Comments

Paul B Over a year ago

Thanks @MathiasRJessen as described above I realised from the answers is that what I wanted was every other element in the array

Mathias R. Jessen Over a year ago

Every second match in $_.Matches or every second Group in each match?

Paul B Over a year ago

Every second in groups. The code ended up as: $socketname = ($energenie.RawContent | select-string $regexname -AllMatches).matches For ($i = 1; $i -lt ($socketname.groups).count; $i+=2) { Write-Output "$(($socketname.groups[$i].Value).Trim())" }

Rohit Gupta · Accepted Answer · 2015-10-25 22:39:51Z

1

This should work:

$energenie.RawContent | select-string $regexname -AllMatches | ForEach-Object { Write-Host $_.Matches.Groups[1].Value }

edited Oct 25, 2015 at 22:39

Rohit Gupta

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answered Oct 25, 2015 at 22:33

Buxmaniak

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2 Comments

Paul B Over a year ago

Thanks @rohitgupta I now realised I was making an assumption and asked the wrong question. I was wanting a piped ForEach-Object to either return a list of unique names, TV, PS3 or repeat the same value representing a count of matches TV, TV due to the Index. I've now used your example to capture the groups collection but step through every other element to get TV, PS3

Rohit Gupta Over a year ago

@PaulB, I only edited it. Buxmaniak actually posted this. If this is not rubbish then you should upvote it. And if it solves your problem then you should tick it.

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