reg.py

# Only need to compile the regex once, outside the loops
orderItem = re.compile("[][A-Z]{2}[0-9]{3,7}[.]")

for file in os.listdir('.'):
	detailsList = []
	if file.endswith(".log"):
		logfile = open(file) # File opens as read only by default
		for line in logfile:
			orderItemMatches = orderItem.findall(line)
			if orderItemMatches:
				# orderItemMatch = orderItemMatch.translate(None, ".") # Not sure what the translate method does
				detailsList.append(orderItemMatches[0])