regex demo

Pwsh/Regex/Match-Captures-Groups-Collections.ps1

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+
+$single = [regex]::Matches('a9', '9')
+
+$few = [regex]::Matches('sda324r32 d23 ew', '(?<Token>.+)')
+$few.Captures.Groups | Ft
+$few.Groups | Ft
+
+$single[0].Groups                        | Ft ; hr ;
+$single[0].Captures.groups               | Ft
+                                           hr -fg magenta
+$few[0].Groups                           | Ft ; hr ;
+$few[0].Captures.groups                  | Ft
+
+$single | %{ $_.Captures[0].Groups[0].gettype()   } # -is <Match : Group>
+$single | %{ $_.Captures[0].Groups[999].gettype() } # -is <Group : Capture>
+$single | %{ $_.Captures[0].Groups.count }          # but the length is 1
+
+$few | %{ $_.Captures[0].Groups[0].gettype()   } # -is <Match : Group>
+$few | %{ $_.Captures[0].Groups[999].gettype() } # -is <Group : Capture>
+$few | %{ $_.Captures[0].Groups.count }          # but the length is 2
+
+$few | %{ $Null -eq $_.Captures[1] } # Is always true null for >= 1