Is there a wildcard for "any number" in Windows search
I don't believe there's a specific wildcard for a "number" rather than a character, but you can make use of the DOS-type wildcards * and ?.
* would match 0 or more characters, while ? would match a single character.
You can also use the filename: flag to indicate you only want to search filenames.
For example, you could try this in the Windows Explorer search box: filename:*-???x???.jpg