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added regex tutorial · furkaneren1/pythoncode-tutorials@ecf941b · GitHub

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added regex tutorial
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‎README.md‎

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@@ -95,6 +95,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
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- [How to Read Emails in Python](https://www.thepythoncode.com/article/reading-emails-in-python). ([code](python-standard-library/reading-email-messages))
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- [How to Download and Upload Files in FTP Server using Python](https://www.thepythoncode.com/article/download-and-upload-files-in-ftp-server-using-python). ([code](python-standard-library/download-and-upload-files-in-ftp))
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- [How to Work with JSON Files in Python](https://www.thepythoncode.com/article/working-with-json-files-in-python). ([code](python-standard-library/working-with-json))
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- [How to Use Regular Expressions in Python](https://www.thepythoncode.com/article/work-with-regular-expressions-in-python). ([code](python-standard-library/regular-expressions))
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- ### [Using APIs](https://www.thepythoncode.com/topic/using-apis-in-python)
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- [How to Automate your VPS or Dedicated Server Management in Python](https://www.thepythoncode.com/article/automate-veesp-server-management-in-python). ([code](general/automating-server-management))

‎python-standard-library/regular-expressions/README.md‎

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# [How to Use Regular Expressions in Python](https://www.thepythoncode.com/article/work-with-regular-expressions-in-python)

‎python-standard-library/regular-expressions/finditer.py‎

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

‎python-standard-library/regular-expressions/match.py‎

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

‎python-standard-library/regular-expressions/search.py‎

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

‎python-standard-library/regular-expressions/sub.py‎

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

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