This is a regex for the above mentioned data clean up

There too many images that don't fit the category. I had to put this regexp to have higher change finding them.

When in Drupal you upload a file with the same filename a new file name is created with _.. The regexp is made to filter the supposedly original filename. After checking existence and filelength match the presuppostion is confirmed and deduplication takes place.

Search between Start Anchor and first word with two characters

This regex will parse a line of csv data, capturing each field.