import re
p = re.compile(r'(?:Rs\.?|INR)\s*(\d+(?:[.]\d+)*)\b(?!\,)|(?<!\d\,)\b(\d+(?:[.]\d+)*)\s*(?:Rs\.?‌​|INR)')
s = "Rs. 2000 , Rs.3000 , Rs 40,000.00 ,50,000 INR 600.25 INR"
print([x if x else y for x,y in p.findall(s)])