I’ve been doing some work on the Delimited Text importer this weekend. Nothing big — just some simple changes to make the import process work better — particularly when dealing with csv files (which MarcEdit periodically splits up incorrectly when dealing with MS Excel data). Anyway, I think I’ve got a much better process using a much better set of regular expressions. You can get the update at: MarcEdit50_Setup.exe if this affects you.
–TR