CODEWITHSUNDEEP
regexpowershell
Ovidiu Buligan
Ovidiu Buligan

Reputation: 2812

Powershell simple regex capture group not capturing

I seam to be having the hardest times with this simple regex in powershell. I want to capture the (\d+) group of this simple match expression :

$myvar = ([regex]'<element attr="(\d+)">').Matches('<element attr="1">')

The problem is that $myvar[1] is not defined no matter what I try.

When I run this regex in sublime text replace tool it captures the group correctly.

What am doing wrong in this simple script ?

Upvotes: 2

Views: 3140

Answers (2)

Ansgar Wiechers
Ansgar Wiechers

Reputation: 200523

Unless you want to use callbacks in a replacement I'd recommend using Select-String or the -match operator instead of a regex object.

PS> $m = '<element attr="1">' | Select-String '<element attr="(\d+)">'
PS> $m.Matches[0].Groups[1].Value
1
PS> '<element attr="1">' -match '<element attr="(\d+)">'
True
PS> $matches[1]
1

Upvotes: 3

briantist
briantist

Reputation: 47872

$myvar is a collection of Match objects. There's only one match, so $myvar[0] is the first Match object.

From there you can access .Captures or .Groups to get your capture group.

It would be $myvar[0].Captures[0].Value or $myvar[0].Groups[1].Value, depending on how you want to refer to it.

Upvotes: 3

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