import re
regex = re.compile(r"""
# Adding password requirements are as easy as tacking on
# another (?=...) group.
^
(?=(?:[^a-z]*[a-z]){1}) # At least {1} lowercase 'a-z' letter
(?=(?:[^A-Z]*[A-Z]){2}) # At least {2} uppercase 'A-Z' letters
(?=(?:[^0-9]*[0-9]){3}) # At least {3} digits
(?=(?:[^\s]*[\s]){1}) # At least {1} whitespace
(?=(?:[^[:punct:]]*[[:punct:]]){1}) # At least {1} special char
(?=.{9}) # A minimum of 9 characters
""", flags=re.MULTILINE | re.VERBOSE)
test_str = ("See 'unit tests' to see all matching/non-matching examples.\n")
matches = regex.finditer(test_str)
for match_num, match in enumerate(matches, start=1):
print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}")
for group_num, group in enumerate(match.groups(), start=1):
print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html