import re
reg = r"(?m)^[A-Z]+\r?\n\S+\s+(\d+)(?:\r?\n\S+\s+\1)+$"
text = ("ONE\n"
"1234234534564 123\n"
"34erewrwer323 123\n"
"123fsgrt43232 123\n"
"TWO\n"
"42433412133fr 234\n"
"fafafd3234132 342\n"
"THREE\n"
"sfafdfe345233 3234\n"
"FOUR\n"
"324ereffdf343 4323\n"
"fvdafasf34nhj 4323\n"
"fsfnhjdgh342g 4323")
for m in re.finditer(r'(?m)^[A-Z]+\r?\n\S+\s+(\d+)(?:\r?\n\S+\s+\1)+$', text):
print(m.group())
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