dir | foreach { tf rename $_ { $_.Name -replace '^5', '2.3.2' } }

dir | foreach { $newname = $_.Name -replace "^5", "2.3.2"; tf rename $_ $newname }

dir | foreach { $newname = $_.Name -replace "^5", "2.3.2"; tf rename $_ $newname }

dir -filter 5* | foreach { tf rename $_ ($_.Name -replace '^5', '2.3.2')}

6# dir -filter 5* | foreach { echoargs rename $_ { $_.Name -replace '^5', '2.3.2' } }
Arg 0 is <rename>
Arg 1 is <5foo.txt>
Arg 2 is <-encodedCommand>
Arg 3 is <IAAkAF8ALgBOAGEAbQBlACAALQByAGUAcABsAGEAYwBlACAAJwBeADUAJwAsACAAJwAyAC4AMwAuADIAJwAgAA==>
Arg 4 is <-inputFormat>
Arg 5 is <xml>
Arg 6 is <-outputFormat>
Arg 7 is <text>

dir . | foreach { $newname = $_.Name -replace "^5", "2.3.2"; tf rename $_ $newname }