Help with batch renaming

OK, try adding this to your scripts folder… Done slighty long hand so's you can swap about if needed…

To run select Custom Rename at the bottom of the Tools menu…

#target bridge
#engine main
if ( BridgeTalk.appName == 'bridge' ) {
          var toolMenu = MenuElement.find( 'Tools' ), 
  
          customRename = new MenuElement( 'command', 'Custom Rename', '-at the end of toolMenu', 'muppet009' );
};
customRename.onSelect = function () { renameFiles(); }
function renameFiles() {
  
          if ( app.documents.length == 0 ) { return; }
  
          var i, count, doc, file, parts, baseName, ext, oldName, newName;
  
          doc = app.document;
  
          count  = doc.visibleThumbnailsLength;
  
          for ( i = 0; i < count; i++ ) {
  
                    if ( doc.visibleThumbnails.type == 'file' ) {
  
                              oldName = decodeURI( doc.visibleThumbnails.name );
  
                              baseName = oldName.match( /(.*)\.[^\.]+$/ )[1];
  
                              ext = oldName.replace( /^.*\./,'' );
  
                              parts = baseName.split( '-', 4 );
  
                              newName = parts[0] + '-' + parts[1] + '-' + parts[3] + '-' + parts[2];
  
                              if ( ext != '' ) { newName += '.' + ext; }
  
                              file = doc.visibleThumbnails.spec;
  
                              //$.writeln( newName );
  
                              file.rename( newName );
  
                    };
  
          };
  
};