Complex file rename

I have some 100 files in a folder. I want to rename those files. The format of files is like

AB1234.gif    
B3245.gif  
AB2541.gif  
AB11422.jpg 

and so on..

Output files shld be

AB-0111-1.gif
B-0111-2.gif
AB-0111-3.gi开发者_StackOverflowf
AB-0111-4.jpg

Logic will be

for(int n=0;n<files.count;n++){
    if(file is starting with AB)
        fileName = AB + "-0111" + n;
    if(file is starting with B)
        fileName = B + "-0111" + n;
}

Is this thing possible with powershell script?

With the filename format that you describe, you can use the powershell -replace operator to replace the middle digits with the expression that you want. The only tricky part is that you have to maintain a counter as you loop through the items. It would look like this:

dir | foreach -begin{$cnt = 1} -process { mv $_ ($_.Name -replace '\d+',"-0111-$cnt"); $cnt += 1}

You can use [System.IO.Path]::GetExtension to get the extension of the file like this:

$ext = [System.IO.Path]::GetExtension('AB1234.gif')

and you can get the first alpha characters of the file name using the $matches variable like this:

if ('AB1234.gif' -match '^\D*') { $first = $matches[0]; }

and you can build your new file name like this:

$first + '-0111-' + '1' + $ext

You can replace the '1' above with a variable that you can increment by checking the exists property like this:

$i = 1;
while (test-path ($first + '-0111-' + $i + $ext)) {$i++}

when this loop completes, you will have the file name you need with $first + '-0111-' + $i + $ext and you can use this to rename the file with Rename-File:

Rename-File 'AB1234.gif' ($first + '-0111-' + $i + $ext)

now, wrap all that up in a loop and you should have it:

dir | ForEach-Object { ... }

for testing, add the -whatif parameter to the end of the Rename-File command and PS will tell you what it would do instead of actually performing the action.

thanks, mark