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