add rating to file name

I think a little more info is needed… This works here on a bunch of my *.ai files…

Is whats behind the last underscore always digits like your example…?

What file extensions do you need to deal with…?

Im sure a better expression could be used…

#target bridge
renameSelectedFiles();
function renameSelectedFiles() {
    
    var i, count, doc, file, rate, oldName, newName;
    
    doc = app.document;
    
    count = doc.selectionsLength;
    
    for ( i = 0; i < count; i++ ) {
        
        rate = doc.selections.rating;
        
        oldName = decodeURI( doc.selections.spec.name );
        
        newName = oldName.replace( /_.+\.ai$/i, '_' + rate + '.ai' ); // I already know the extension
        
        doc.selections.spec.rename( newName );
        
    };
    
};