Practice Arena

Python Coding
Challenges

Write real Python in the browser. Instant feedback. From beginner to expert.

925 challenges 556 easy 323 medium 46 hard

All Easy Medium Hard

All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python Iterators & Generators Decorators & Context Managers Error Handling & Exceptions Regular Expressions Math & Number Theory Bit Manipulation Dynamic Programming Trees & Binary Trees Graphs & Graph Algorithms Recursion & Backtracking Greedy Algorithms Binary Search Two Pointers & Sliding Window Stacks & Queues Heaps & Priority Queues Linked Lists Matrix & 2D Arrays Datetime & Time Calculations Data Formats & Parsing SQL & SQLite Numpy & Vectorized Computing Cryptography & Hashing

Regular Expressions medium

Validate Email Regex

Implement a function that validates email addresses using regex with specific rules.

regex email validation

Regular Expressions easy

Validate phone number

Write a function that uses regular expressions to determine if a given string is a valid US phone number.

regex validation phone

Regular Expressions easy

Match IPv4 Address

Write a function that uses a regular expression to check if a string is a valid IPv4 address.

regex validation ipv4

Regular Expressions hard

Match IPv6 Address

Write a function that uses a regex to validate whether a string is a fully expanded IPv6 address.

regex validation ipv6

Regular Expressions medium

Match Credit Card Pattern

Write a function that validates a credit card number string against a set of formatting rules.

regex validation credit-card

Regular Expressions easy

Validate Hex Color Code

Write a function that validates hex color codes using regular expressions.

regex validation strings

Regular Expressions easy

Multiline anchor match

Extract lines beginning with a plain-text prefix from multiline strings using Python's re module.

regex anchors multiline

Regular Expressions easy

Match Balanced Parentheses with Regex

Write a function that uses regular expressions to determine if parentheses are balanced and properly nested.

regex strings validation

Regular Expressions easy

Match scientific notation

Implement a function that checks if a string is in valid scientific notation.

regex validation scientific-notation

Regular Expressions easy

Non-greedy quantifier

Implement a function that uses a non-greedy regex to extract the shortest substring between two delimiters.

regex lazy quantifier string parsing

Showing 1–10 of 10 challenges · Regular Expressions

Regular Expressions — Python coding challenges

What you will find here

This page lists regular expressions challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.

Challenges vs tutorials and quizzes

Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.