Regex in python, find a range of lengths

Question

I'm doing a regex on a string to find a certain pattern:

fileName = '123456_BI12554_AA_0021.jpg'
id = re.findall(r'(_BI\d{5}_)', fileName)

Which finds _BI12554_ but sometimes there are 6 digits and not just 5.

Is there a way to find all the digits between _BI and _ regardless of how many there are?

Answer 1

Yes of course: you can use + to mean "1 or more" digits.

re.findall(r'(_BI\d+_)', fileName)