🔗 Day 31 of #100DaysOfCode in Python: Demystifying Regular Expressions

Welcome to Day 31, where we delve into the world of Regular Expressions, commonly known as regex. This powerful tool is essential for searching, matching, and manipulating text patterns, providing a versatile way to process strings in Python.

1. What are Regular Expressions?

Regular expressions are a sequence of characters that form a search pattern. They can be used to check if a string contains the specified search pattern, to replace the search pattern with another string, or to split a string around the pattern.

2. Python’s re Module

Python has a built-in module called re, which allows you to work with regular expressions. First, import the module:

import re

3. Basic Regex Functions

• re.search(pattern, string): Checks if the pattern is present anywhere in the string.
• re.match(pattern, string): Checks for a match only at the beginning of the string.
• re.findall(pattern, string): Finds all occurrences of the pattern in the string.
• re.sub(pattern, replace, string): Replaces the occurrences of the pattern with a specified string.