I remember suggesting that calibre allow saving the regex from Add Books. Kind of like the Edit Metadata dialog does, which would allow the regex to be named and facilitate re-use. Not sure what the response was... anyway...
I just wanted to add that if you don't have enough space in the MRU list (unlikely but), you can always create a text file with two columns: regex name and expression. You could use this text file as a kind of library, cutting and pasting the necessary regex into the field as needed.
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