@theducks - I just used this expression for your example:
(?P<title>.*?) \((?P<pubdate>.*)\) ISBN (?P<identifier:isbn>.*)
If you want to populate the author, just paste it directly into the preview grid on the right side of that first Step 1 of the wizard. All columns are editable there, so you can do any "input" cleanup you require before moving to Step 2.
I had no issues with populating the published date with just that 1969 - calibre created the empty book with a date of 1 Jan 1969 with no extra help.