import re
input_str = "6.5 from1.2 .34 12.34 13.44.55 12.34.55.66 11.43 12.3 12. 12.78~ fdasfdashf 66.8987"
print(re.findall(r"(?<!\S)\d+\.\d+(?!\S)", input_str))
# 6.5, 12.34, 11.43, 12.3, 66.8987
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