How to write regular expressions

[LISP]

Hi
I want to separate only the numbers in brackets [test10] [test25] [test30].
I tried. I wrote the regular expression below to extract the contents.
regex("(?<=\[)[^]]*(?=\])")

result : test10, test25, test30 (remove parentheses)

But it couldn't separate alphabets and numbers.

I want to write a regular expression that can extract only the numbers in parentheses.
And I want to put that number in a list.
list.append(10)
list.append(25)
list.append(30)

[JonB]

@LISP
Assuming your input strings are always <letters><digits> you might replace the [^]]* with something like

([A-Za-z]*)\\d*

to capture the letter parts.

A site like https://regex101.com/ is useful to go play till you get what you want.