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Returns all keys matching pattern.

While the time complexity for this operation is O(N), the constant times are fairly low. For example, Redis running on an entry level laptop can scan a 1 million key database in 40 milliseconds.

Warning: consider KEYS as a command that should only be used in production environments with extreme care. It may ruin performance when it is executed against large databases. This command is intended for debugging and special operations, such as changing your keyspace layout. Don't use KEYS in your regular application code. If you're looking for a way to find keys in a subset of your keyspace, consider using sets.

Supported glob-style patterns:

  • h?llo matches hello, hallo and hxllo
  • h*llo matches hllo and heeeello
  • h[ae]llo matches hello and hallo, but not hillo

Use \ to escape special characters if you want to match them verbatim.

@return

@multi-bulk-reply: list of keys matching pattern.

@examples

MSET one 1 two 2 three 3 four 4
KEYS *o*
KEYS t??
KEYS *
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