KEYS pattern matching (avoid in production) in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all keys starting with 'user:'.

Redis

KEYS [1]

Drag options to blanks, or click blank then click option'

Auser:*

Buser?

C*user

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user?' matches only keys with exactly one character after 'user'.

Using '*user' matches keys ending with 'user', not starting with it.

Using 'user' matches only the exact key 'user'.

The pattern user:* matches all keys that start with 'user:'.

2fill in blank

medium

Complete the code to find all keys that have exactly 5 characters.

Redis

KEYS [1]

Drag options to blanks, or click blank then click option'

A?????

B*

C????

D??????

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' matches any length, not exactly 5 characters.

Using fewer or more ? will match keys of wrong length.

The pattern ????? matches keys with exactly 5 characters, each ? matches one character.

3fill in blank

hard

Fix the error in the code to find keys ending with ':id'.

Redis

KEYS [1]

Drag options to blanks, or click blank then click option'

A*id:

B*:id

C:id*

Did:*

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':id*' matches keys starting with ':id', not ending.

Using '*id:' or 'id:*' do not match keys ending with ':id'.

The pattern *:id matches keys that end with ':id'.

4fill in blank

hard

Fill both blanks to find keys that start with 'session:' and have exactly 8 characters after the colon.

Redis

KEYS [1][2]

Drag options to blanks, or click blank then click option'

Asession:

Buser:

C????????

D???????

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user:' instead of 'session:' will match wrong keys.

Using 7 question marks matches 7 characters, not 8.

The pattern session:???????? matches keys starting with 'session:' followed by exactly 8 characters.

5fill in blank

hard

Fill all three blanks to find keys that contain 'cache' anywhere and end with a digit.

Redis

KEYS [1][2][3]

Drag options to blanks, or click blank then click option'

A*cache*

B*

C[0-9]

Dcache

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cache' alone matches only keys exactly equal to 'cache'.

Using '*cache*' without [0-9] does not ensure the key ends with a digit.

Using '[0-9]' alone does not match keys containing 'cache'.

The pattern *cache*[0-9] matches keys containing 'cache' anywhere and ending with a digit.