How to Play

Matchmaker Mode

• Click a string on the left
• Click its matching pattern on the right
• Press Match! to confirm
• Clear all matches to complete the level

Match Quality

• Best Match = +3 points (ideal pattern)
• Acceptable = +2 points (works but less specific)
• Too Broad = +1 point (matches but sloppy)
• Wrong = -1 point (doesn't match)

Regex Cheat Sheet

Character Classes

Quantifiers

Anchors & Special

Real-World Patterns

• Email: \w+@\w+\.\w+
• Phone: \d{3}-\d{3}-\d{4}
• URL: https?://\w+\.\w+
• Date: \d{4}-\d{2}-\d{2}
• Price: \$\d+\.\d{2}
• IP Address: \d+\.\d+\.\d+\.\d+
• Hex Color: #[A-Fa-f0-9]{6}

Why Regex Matters in Python

Real Python Uses

• Validating emails, usernames, passwords
• Finding numbers in text
• Cleaning messy data
• Searching log files for patterns
• Extracting hashtags and mentions
• Replacing or censoring content

Python Examples

import re

# Find all numbers in text
text = "Order #48291 shipped!"
nums = re.findall(r"\d+", text)
print(nums)  # ['48291']

# Validate email format
email = "user@example.com"
if re.fullmatch(r"\w+@\w+\.\w+", email):
    print("Valid email!")

# Replace words
text = "Hello World"
result = re.sub(r"World", "Python", text)
print(result)  # "Hello Python"

Key Functions

• re.search() - Find first match
• re.findall() - Find all matches
• re.sub() - Replace matches
• re.fullmatch() - Exact match check