import re

pattern = r"(?<=\()\d+(?:\.\d+)?(?=%\))|\d+(?:\.\d+)?(?=\s*\[[^][]*])"
strings = ['73 (1.40%)', '38 (1.55%)', '27 (2.17%)', '32 (1.46%)', '10 (1.46%)', '11 (1.04%)', '11 (1.41%)', '7 (1.34%)', '4 (1.24%)', '28 (1.27%)', '750 (14.41%)', '381 (15.54%)', '182 (14.60%)', '313 (14.27%)', '4.10 [3.73 - 4.45]', '4.08 [3.70 - 4.42]', '4.13 [3.77 - 4.47]', '4.13 [3.78 - 4.47]', '4.07 [3.70 - 4.42]', '4.07 [3.70 - 4.43]', '4.07 [3.70 - 4.40]', '4.09 [3.73 - 4.42]', '4.03 [3.63 - 4.40]', '4.10 [3.70 - 4.47]']
for val in strings:
    match = re.search(pattern, val)
    print(match)