Apparently you didn't read the stickies in full - the PDF FAQ includes links to both the search and replace tutorial and the regular expression tutorial:
Search & Replace:
https://www.mobileread.com/forums/sho...d.php?t=118570
Regular Expressions:
https://www.mobileread.com/forums/sho...d.php?t=118569
Anway what you want to wildcard any numbers is \d+ e.g.: