How to use regular expressions to write "x" occurs more than 1 time in a row?

Question

linux

That is, so that the file with the name - site.com-1200x1600_67bd2cbd2fe26eab9480356a35c80eb9-1152x1536 matches the regular expression, and the file with the name - site.com-1200x1600_67bd2cbd2fe26eab9480356a35c80eb9 does not.

Answer 1

x[^x].*x- like this

Under the same rule, it’s better to compose it so
if the resolution occurs twice
[0-9]+x[0-9]+.+[0-9]+x[0-9]+

[0-9]+x- the numbers are 1 time and more
if the whole line
https://regex101.com/r/jJenlF/1

Answer 2

For example, like this: x[^x]+x. True, depending on what is considered "not in a row", here is "xxx" - is it in a row or not?