import re

text = """
#BS
#BC
RESULT 
LB1 21406.00
LB2 22073.00
LB3 15407.00
LB4 20382.00
LS1 0.00
LS2 0.00
LS3 0.00
LS4 0.00
REND
"""

pattern = re.compile(r'(LB[1-4])\s+([\d.]+)')

matches = pattern.findall(text)

for match in matches:
    label, value = match
    print(f'{label}: {value}')