Python regex match last word of a string

No regex needed, actually:

string = "crypto map OUTSIDEMAP 540 match address 3P-DC-CRYPTO"

# check for address as well
words = string.split()
if words[-2] == 'address':
    last_word = words[-1]
    print(last_word)

This checks for address and then captures the last word.

You can do it by capturing the desired word like this:

>>> crypto_acl = re.findall("address ([-\w+]*)",output)
>>> crypto_acl
['3P-DC-CRYPTO']

Also, since you've mentioned in the question that you need the last word of a string, you can simply do it like this, without explicitly looking for the word after address:

>>> crypto_acl = re.findall(r"\b([-\w+]+)$",output)
>>> crypto_acl
['3P-DC-CRYPTO']
#or simply 
>>> crypto_acl = output.split()[-1]
>>> crypto_acl
'3P-DC-CRYPTO'

Live demo here

Try with regex search,

import re

str = "crypto map OUTSIDEMAP 540 match address 3P-DC-CRYPTO"

result = re.search(r'(address .*)', str)

result.group()                          # return as 'address 3P-DC-CRYPTO'


result = re.search(r'address (.*)', str)

result.group()                     #  return as 'address 3P-DC-CRYPTO'
result.group(0)                   #  return as 'address 3P-DC-CRYPTO'
result.group(1)                  #  return as '3P-DC-CRYPTO'

You can use Positive Lookbehind and capture the group():

import re
pattern=r"(?<=address )[\w-]+"
string_1="crypto map OUTSIDEMAP 540 match address 3P-DC-CRYPTO"
match=re.finditer(pattern,string_1,re.M)
for i in match:
    print(i.group())