Python Filter List of Strings Startswith

πŸ’‘ Problem Formulation: When working with lists of strings in Python, a common task is to filter the list based on whether the strings start with a specific prefix. Suppose you have a list of names, and you want to retrieve only those that start with the letter “J”. Below are several methods to accomplish … Read more

5 Ways to Filter a List of Strings Based on a Regex Pattern in Python

πŸ’‘ Problem Formulation: When working with a list of strings in Python, a common task is to filter the list based on specific patterns. Regular Expressions (regex) are a powerful way of defining these patterns, enabling complex matching criteria that can go well beyond simple substring checks. Let’s see how we can use regex to … Read more

5 Best Ways to Count the Number of Specific Chars in a Python String

When working with text in Python, a common task is to determine how often a specific character or set of characters occurs within a string. This can be useful in various applications such as data preprocessing, parsing, or simply assessing the content of a string. πŸ’‘ Problem Formulation: The task is to write a Python … Read more

Regex to Extract All Email Addresses from a String βœ… (Tutorial + Online Tool)

I have just created this small helper tool to extract all email addresses from a huge text file or string. Simply copy and paste your text into the field and click “Extract Emails“: πŸ‘‡ Email Extractor Enter Text: Extract Emails Copy to Clipboard Extracted Emails: JavaScript Regex In the online tool above, I used a … Read more

Python – How to Open a File by Regular Expression?

In Python, you can use the glob module’s glob.glob(pattern) function to find all the pathnames matching a specified pattern (e.g., ‘*.py’) according to the rules used by the Unix shell, which includes functionality for wildcard matching that can be used similarly to regular expressions for filename matching. Here’s a minimal example that filters out all … Read more

Best Ways to Remove Unicode from List in Python

When working with lists that contain Unicode strings, you may encounter characters that make it difficult to process or manipulate the data or handle internationalized content or content with emojis 😻. In this article, we will explore the best ways to remove Unicode characters from a list using Python. You’ll learn several strategies for handling … Read more

Python Regex Lookahead and Lookbehind — A Helpful Guide

Python Lookahead You might find yourself working with regular expressions in Python, and the lookahead feature is quite handy in many situations. Lookahead comes in two flavors: positive lookahead and negative lookahead. Let’s explore these types of lookahead and see how you can use them in your Python code! 🐍 Positive lookahead is an assertion … Read more