import re

s = "A 1 (B 2 C 3 D 4) E 5"

re.findall("(w+sd+)", s)                   # ['A 1', 'B 2', 'C 3', 'D 4', 'E 5']
re.findall("(?<=()(w+sd+)", s)            # ['B 2']
re.findall("(w+sd+)(?=))", s)             # ['D 4']
re.findall("(?<=()(w+sd+)(?=))", s)      # []

# desired result: ["B 2", "C 3", "D 4"]

import re

s = "A 1 (B 2 C 3 D 4) E 5"
m = re.search(r"((?P<content>.*?))", s)
if m:
    val = m.group("content")
    print(re.findall(r"ws+d", val))

['B 2', 'C 3', 'D 4']

s = "A 1 (B 2 C 3 D 4) E 5 (X 2 Y 3 Z 4) V 4"
for m in  re.findall(r"(.*?)", s):
    print(re.findall(r"ws+d", m))

['B 2', 'C 3', 'D 4']
['X 2', 'Y 3', 'Z 4']