# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"(\\u[0-9a-zA-Z]{4})(?!\\u[0-9a-zA-Z]{4}).*?(\\u[0-9a-zA-Z]{4})"
test_str = ("\\u0442\\u0435\\u043a\\u0441\\u0442\\u0020\\u0432\\u0020\\u044e\\u043d\\u0438\\u043a\\u043e\\u0434\n\n"
"\\u0442\\u0435dsds\\n\\u043a\\u0441\\u0442das\\u0020\\u0432dsdddddd\\u0020\\u044e\\u043d\\n\\n\\n\\u0438\\u043a\\u043e\\u0434")
subst = "\\1\\2"
# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0)
if result:
print (result)
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
