import re
test = "example(test)"
test2 = "example(test)example"
test3 = "(test)example"
test4 = "example (test) example"
for i in [test, test2, test3, test4]:
    print(re.sub(r"[^\S]?(\(.*?\))[^\S]?", r" \1 ", i).strip())

example (test)
example (test) example
(test) example
example (test) example

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