import re

regex = r"\{'[^']+':\s*\['([^][]+)'\]}"

test_str = ("email                                    id\n"
	"{'email': ['test@test.com']}           {'id': ['123abc_d456_789_fgh']}")

subst = "\\1"

result = re.sub(regex, subst, test_str, 0)

if result:
    print (result)