KEYS pattern matching (avoid in production) in Redis - Mini Project: Build & Apply

Using Redis KEYS Pattern Matching (Avoid in Production)

📖 Scenario: You are managing a Redis database that stores user session data with keys that include user IDs and session info. You want to find all keys related to a specific user quickly.

🎯 Goal: Build a simple Redis command sequence to find all keys matching a pattern for a specific user ID using the KEYS command.

📋 What You'll Learn

Create keys in Redis with exact names: session:1001, session:1002, session:1003, cache:1001, cache:1002

Set a pattern variable called pattern with the value session:100*

Use the KEYS command with the pattern variable to find matching keys

Store the result in a variable called matching_keys

💡 Why This Matters

🌍 Real World

Finding keys by pattern helps in debugging and managing Redis data during development or small projects.

💼 Career

Understanding Redis key pattern matching is useful for roles involving caching, session management, and fast data retrieval.

1

DATA SETUP: Create Redis keys for sessions and cache

Create Redis keys with exact names: session:1001, session:1002, session:1003, cache:1001, and cache:1002. Use the SET command to assign any string value to each key.

Redis

# Your code here

Need a hint?

Use the SET command followed by the key name and a string value.

2

CONFIGURATION: Define the pattern variable

Create a variable called pattern and set it to the string session:100* to match all session keys starting with session:100.

Redis

SET session:1001 "data1"
SET session:1002 "data2"
SET session:1003 "data3"
SET cache:1001 "cache1"
SET cache:1002 "cache2"

# Define the pattern variable
# Your code here

Need a hint?

Assign the pattern string to a variable named pattern.

3

CORE LOGIC: Use KEYS command with the pattern variable

Use the KEYS command with the variable pattern to find all keys matching the pattern. Store the result in a variable called matching_keys.

Redis

SET session:1001 "data1"
SET session:1002 "data2"
SET session:1003 "data3"
SET cache:1001 "cache1"
SET cache:1002 "cache2"

pattern=session:100*

# Use KEYS command with pattern and store in matching_keys
# Your code here

Need a hint?

Use KEYS followed by the pattern string to find matching keys and assign to matching_keys.

4

COMPLETION: Finalize the Redis command sequence

Ensure the Redis commands include setting the keys, defining the pattern variable, and using the KEYS command to assign matching keys to matching_keys.

Redis

SET session:1001 "data1"
SET session:1002 "data2"
SET session:1003 "data3"
SET cache:1001 "cache1"
SET cache:1002 "cache2"

pattern=session:100*

matching_keys=$(redis-cli KEYS "$pattern")

# Finalize your Redis commands here
# Your code here

Need a hint?

Review all previous commands to ensure completeness and correctness.