How to display files by name in the terminal that have two-digit numbers or more?

Question

linux

For example, there are a number of files
test1212test.txt
test1211test.txt
test12test.txt
test21test.txt
test2121test.txt
test33test.txt
test1test.txt
test2test.txt
test3test.txt
For example, in order to display the files test1test.txt test2test.txt you need to type the following command in the terminal:
ls test[12]test.txt
The terminal will output the following:
test1test.txt test2test.txt
How to output through the ls files test1211test.txt test1212test.txt in the same way?
Through square brackets it is impossible - are limited to numbers 0-9.

Answer 1

If you need to display files with 4 digits in the middle, you must specify
test\d{4}test.txt like this. If from 2 to 4 digits, then
test\d{2,4}test.txt. Further by analogy.
Or, abstractly, there are several characters between test and test.txt, no matter if they are numbers or letters. Then you can try this. Though ugly, but it works.
Or if you need to display the numbers in order, then something like this

Answer 2

Add a plus - ls test[1234567890]+test.txtor at all ls test\d+test.txt
(I'm not strong in bash myself, but it can work)
UPD What I took for a regular expression is bash expansion . Here you can use ls | egrep '^test\d+test.txt$'or something similar

Answer 3