Advanced Challenges

You've learned the fundamentals. Now let's combine everything in challenging exercises!

Challenge 1: Credit Card Masking

Challenge 2: Password Strength

Challenge 3: Date Format Conversion

Challenge 4: HTML Tag Extraction

Challenge 5: Semantic Versioning

Challenge 6: IPv4 Validation

Challenge 7: Markdown Links

Challenge 8: Remove Duplicates

Challenge 9: CSS Color Values

Challenge 10: SQL Injection Detection

Ultimate Challenge: Complete Parser

Build a parser for this log format:

[2024-01-15 10:30:45] INFO  user=john action="login" ip=192.168.1.1 status=success

Try to extract:

• Timestamp: \[([^\]]+)\]
• Log level: (INFO|ERROR|WARN)
• User: user=(\w+)
• Action: action="([^"]+)"
• IP: ip=([\d.]+)
• Status: status=(\w+)

Congratulations!

You've completed the Regex Practice course! You now have skills to:

• Match literal text and special characters
• Use character classes and ranges
• Apply quantifiers for repetition
• Anchor patterns to positions
• Create and reference groups
• Use lookahead and lookbehind
• Build real-world patterns for validation and extraction

Keep practicing - regex mastery comes with experience!