How to use the keys command to match the pattern

How to match patterns using the keys command? The keys command can search for keys for a specified pattern. The pattern supports wildcards: *: Match any character?: Match a single character [and]: Match characters in brackets\: Escape special characters The keys command also supports regular expression matching

How to match patterns using the keys command

Overview

The keys command is used to find all keys that match the specified pattern. This pattern can contain wildcards, allowing for flexible matching.

grammar

 <code>keys <pattern></pattern></code>

Wildcard

• * : Match any number of characters.
• ? : Match a single character.
• [ and ] : Match any character in square brackets.
• \ : Escape characters, used to match special characters (for example, \* means matching characters * itself).

Example

Match all keys starting with "user":

 <code>keys user*</code>

Match all keys with "uid" fields:

 <code>keys *uid*</code>

Match all keys that start with "user" and end with a number:

 <code>keys user[0-9]*</code>

Match all keys that do not start with "system":

 <code>keys !system*</code>

Using regular expressions

The keys command also supports more advanced matching using regular expressions. Regular expressions must be enclosed in / number.

Example

Match all keys containing the letter "a":

 <code>keys /.*a.*/</code>

Match all keys starting with lowercase letters:

 <code>keys /[az].*/</code>

Notice:

• Mode is case sensitive.
• If the schema is not specified, the keys command returns all keys in the database.
• The keys command is a slow operation because it has to iterate through all keys in the database.

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