import re

regex = r"\b[A-Z ]*Q[A-Z ]*(?<![A-Z][A-Z]Q)\d+\.\d+|(\d+\.\d{2})(?!END)"
strings = [
    "ABC WS YMQ234.03WS TOY234.03USD468.06END",
    "FUR BB LAB Q10.00 199.00USD209.00END",
    "YAS DG TYY Q AWSMSN11.32 2503.08LD VET Q JKLOLE11.32 2503.08USD5028.80END",
    "PPP VP LAP Q10.00 M342.41EE SFD Q10.00 282.24USD644.65END"
]

for str in strings:
    print('{}: {}'.format(str, [x.group(1) for x in re.finditer(regex, str) if x.group(1)]))