import re
final_str = 'hello your total sale Fare Rs 741 your bill pls and Sale 2,804.00'
r = re.compile(r'\b(?:Sale|Fare|Rs)\s+(\d+(?:,\d+)*(?:\.\d+)?)', flags=re.I)
gotdata = r.findall(final_str)
print(gotdata)
aW1wb3J0IHJlCmZpbmFsX3N0ciA9ICdoZWxsbyB5b3VyIHRvdGFsIHNhbGUgRmFyZSBScyA3NDEgeW91ciBiaWxsIHBscyBhbmQgU2FsZSAyLDgwNC4wMCcKciA9IHJlLmNvbXBpbGUocidcYig/OlNhbGV8RmFyZXxScylccysoXGQrKD86LFxkKykqKD86XC5cZCspPyknLCBmbGFncz1yZS5JKQpnb3RkYXRhID0gci5maW5kYWxsKGZpbmFsX3N0cikKcHJpbnQoZ290ZGF0YSk=