Question about some sequences

[csarcom]

Hello @asciimoo

I'm having problem to generate two sequences, the first is something like this:

['ABCX9995', 'ABCX9996', 'ABCX9997', 'ABCX9998', 'ABCX9999', 'ABCY0001', 'ABCY0002']

The last part(number sequence) start at 0001 and go until 9999, when it reaches 9999 the letter changes and it should come back to 0001

I've already tried:
'ABC[XY][0-9]{4}'
'ABC[XY][0001-9999]{4}'

The other problem that I'm trying to solve is the start of the sequence, suppose that I have the same sequence above and I want to start it at ABCY1500, Is that possible?

[vwyu]

It looks like 'ABC[XY](000[1-9]|00[1-9][0-9]|0[1-9][0-9]{2}|[1-9][0-9]{3})' solves your first problem.

For your second problem, regex-only solution may be too complicated. Instead, you can try

import exrex

str_list = list(exrex.generate('ABC[XY](000[1-9]|00[1-9][0-9]|0[1-9][0-9]{2}|[1-9][0-9]{3})'))
start = 1500
shift = 9998 + start
new_list = str_list[shift:] + str_list[:shift]
print(new_list)