Regular expression for converting file string in PowerShell
You could do a single -replace operation:
$FileName -replace '^\D+([\.\d]+)\srev\.\s(\d+)','$1.$2'Breakdown:
^\D+ # 1 or more non-digits - matches ie. "Some nameA " ([\.\d]+) # 1 or more dots or digits, capture group - matches the version \srev\.\s # 1 whitespace, the characters r, e and v, a dot and another whitespace (\d+) # 1 or more digits, capture group - matches the revision numberIn the second argument, we refer to the two capture groups with $1 and $2
You can pipe Get-ChildItem to ForEach-Object instead of using a for loop and indexing into $files:
Get-ChildItem . *.zip |ForEach-Object { $_.BaseName -replace '^\D+([\.\d]+)\srev\.\s(\d+)','$1.$2'} | Out-File output.txt