Python Tutorial: re Module - How to Write and Match Regular Expressions (Regex)
Why Stack Overflow recommends it
Stack Overflow users link it as a thorough, beginner-friendly introduction when someone asking a regex question needs to learn the basics of the re module.
Recommended by 4 people across 5 different months, 2015 to 2022.
What it is
A 53-minute Python tutorial by Corey Schafer on writing and matching regular expressions with the re module. It covers common patterns such as emails, phone numbers and URLs, and shows how to parse text and files in Python.
What people said
Strong rec Michael · 2018-06 · Stack Overflow · on “regex to match a word and the first parenteshis i find”
If you don't understand regular expressions, I would highly recommend this video [this video] . It is very thorough and will get you started :)
Recommends Ooker · 2015-09 · Stack Overflow · on “How to remove empty lines with or without whitespace”
If you are not willing to try regex (which you should), you can use this: s.replace('\n\n','\n') Repeat this several times to make sure there is no blank line left. Or chaining the commands: s.replace('\n\n','\n').replace('\n\n','\n') Just to encourage you to use regex, here are two introductory videos that I find intuitive: • Regular Expressions (Regex) Tutorial [LINK] • Python Tutorial: re Module [this video]
Recommends Ooker · 2019-08 · Stack Overflow · on “How to remove empty lines with or without whitespace”
Introductory video: Python Tutorial: re Module - How to Write and Match Regular Expressions (Regex) - YouTube [this video]
Recommends Gabe Morris · 2022-05 · Stack Overflow · on “Python - Parsing String using Regex or other method”
@Randy In case you haven't come across this, here is a good introduction: [this video] He is probably the best there is on YT. Afterwards, you can familiarize yourself with the documentation found here: [LINK]
Recommends Matiiss · 2022-11 · Stack Overflow · on “how to extract words from the string in the list in python?”
@AnshumanSharma This tutorial on regex by Corey Schafer [LINK] , this tutorial on `re` by Corey Schafer [this video] , this HOWTO in the official docs [LINK] and just the documentation of `re` module [LINK] (includes explanation for each character and stuff), as well as [LINK] for practice, explanation and other stuff
Cites grice_d · 2019-08 · Stack Overflow · on “Taking Information From Line Iteration Using Regex and Storing Data in Nested Dictionaries”
Overview I am trying to take information from a file (read line by line), split the data using Regex into a dictionary of dictionaries (nested dictionaries), where the format is { IP1: { Message1 {count}, Message2 {count}, Message3 {count}, etc. }, IP2: { Message1 {count}, Message2 {count}, Message3 {count}, etc. }, etc. }. I just am stuck in taking this information, and placing it into a dictionary of dictionaries with a count per each message. I have a basic working prototype, where it stores {IP1: {message1}, IP2: {message2}, etc.} but it does not store additional messages if number is already in the dictionary. I am using Regex to filter out the noise, and focus only on the signal (what
Cites Joseph Howell-Burke · 2019-12 · Stack Overflow · on “Need to grab users listed inside wheel_user_array. Everything inside of the [] using python re (regex) module”
Apologies for the confusion everyone. I was able to resolve the question. I had a large .pp file which I could not post, but the wheel user array was the block of code I needed to capture out of the large file. I used the following regex command to grab what I needed: Load puppet file with open(puppet_file, 'r') as f: search_strings = f.read() Grab the pattern I needed: pattern = re.compile(r'\s{2}(\$wheel.*\[|])[\s\S]*?(?=\n.*?=|$)') matches = pattern.finditer(search_strings) Cleaned up matches to only store the usernames in a list: for match in matches: reg_string = match.group(0) s = reg_string.splitlines() pe_users = [] for x in s[1:-1]: pe_users.append(x.replace(' ','').replace(',',''))