Combined Character Classes Explained with Examples 1. [a-zA-Z0-9_] – Word characters (same as \w) Description: Matches any letter (lowercase or uppercase), any digit, or underscore Example 1: Extract all word characters from text python import re text = “User_name123! Email: test@example.com” result = re.findall(r'[a-zA-Z0-9_]’, text) print(result) # [‘U’, ‘s’, ‘e’, ‘r’, ‘_’, ‘n’, ‘a’, ‘m’, ‘e’, ‘1’, ‘2’,…

Python’s fame and widespread adoption across various sectors can be attributed to its unique combination of simplicity, versatility, and a robust ecosystem. Here are the key reasons why Python is so popular and widely used in different industries: 1. Easy to Learn and Use 2. Versatility Python supports multiple programming paradigms, including: This versatility allows…

Sets in Python A set in Python is an unordered collection of unique elements. Sets are mutable, meaning you can add or remove items, but the elements themselves must be immutable (like numbers, strings, or tuples). Key Characteristics of Sets: Different Ways to Create Sets in Python Here are various methods to create sets in…

Predefined Character Classes Pattern Description Equivalent . Matches any character except newline \d Matches any digit [0-9] \D Matches any non-digit [^0-9] \w Matches any word character [a-zA-Z0-9_] \W Matches any non-word character [^a-zA-Z0-9_] \s Matches any whitespace character [ \t\n\r\f\v] \S Matches any non-whitespace character [^ \t\n\r\f\v] 1. Literal Character a Matches: The exact character…