Code for How to Use Regular Expressions in Python Tutorial

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match.py

import re # stands for regular expression # a regular expression for validating a password match_regex = r"^(?=.*[0-9]).{8,}$" # a list of example passwords passwords = ["pwd", "password", "password1"] for pwd in passwords: m = re.match(match_regex, pwd) print(f"Password: {pwd}, validate password strength: {bool(m)}")

search.py

import re # part of ipconfig output example_text = """ Wireless LAN adapter Wi-Fi: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::380e:9710:5172:caee%2 IPv4 Address. . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 """ # regex for IPv4 address ip_address_regex = r"((25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])(\.(?!$)|$)){4}" # use re.search() method to get the match object match = re.search(ip_address_regex, example_text) print(match)

finditer.py

import re # fake ipconfig output example_text = """ Ethernet adapter Ethernet: Media State . . . . . . . . . . . : Media disconnected Physical Address. . . . . . . . . : 88-90-E6-28-35-FA Ethernet adapter Ethernet 2: Physical Address. . . . . . . . . : 04-00-4C-4F-4F-60 Autoconfiguration IPv4 Address. . : 169.254.204.56(Preferred) Wireless LAN adapter Local Area Connection* 2: Media State . . . . . . . . . . . : Media disconnected Physical Address. . . . . . . . . : B8-21-5E-D3-66-98 Wireless LAN adapter Wi-Fi: Physical Address. . . . . . . . . : A0-00-79-AA-62-74 IPv4 Address. . . . . . . . . . . : 192.168.1.101(Preferred) Default Gateway . . . . . . . . . : 192.168.1.1 """ # regex for MAC address mac_address_regex = r"([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})" # iterate over matches and extract MAC addresses extracted_mac_addresses = [ m.group(0) for m in re.finditer(mac_address_regex, example_text) ] print(extracted_mac_addresses)

sub.py

import re # a basic regular expression for email matching email_regex = r"[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+" # example text to test with example_text = """ Subject: This is a text email! From: John Doe <john@doe.com> Some text here! """ # substitute any email found with [email protected] print(re.sub(email_regex, "[email protected]", example_text))