How to view keys for a specific pattern

There are two ways to view keys for a specific pattern in Redis: iterate over the database using the SCAN command, returning the keys for matching patterns until the cursor is 0. Use the KEYS command to directly return the keys of all matching patterns.

How to view keys for specific patterns in Redis

Redis provides a variety of ways to find and list keys for a specific schema. Here are the steps to achieve this:

Use the SCAN command

The SCAN command is used to iterate over the database in Redis, returning the key that matches the given pattern. Its syntax is as follows:

 <code>SCAN cursor [MATCH pattern] [COUNT count]</code>

The parameters are as follows:

• cursor : A cursor indicating the scan status. During initial scan, set the cursor to 0.
• pattern : The key pattern to match. Use wildcards * to match 0 or more characters.
• count : The maximum number of keys returned at a time.

To find the keys for matching patterns using the SCAN command:

1. Set the cursor to 0 .
2. Run the SCAN command, specifying the pattern to match and the number of keys to return.
3. Save the returned key list and cursor.
4. Repeat steps 2 and 3 until the cursor is 0 .

Use the KEYS command

The KEYS command returns all keys that match the given pattern. Its syntax is as follows:

 <code>KEYS pattern</code>

where pattern is the key pattern to match.

The steps to find the keys that match patterns using the KEYS command are as follows:

1. Run the KEYS command to specify the pattern to match.
2. Save the returned key list.

Example

The following example shows how to use the SCAN command to find keys that start with "user:*" mode:

 <code>SCAN 0 MATCH user:* COUNT 10</code>

This command returns the first 10 keys that start with "user:*" mode.

The following example demonstrates how to use the KEYS command to find all keys ending in .log :

 <code>KEYS *.log</code>

This command will return all keys ending in .log .

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