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+ #sidebar GenericCommandsSidebar
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+ KEYS _pattern_
+Time complexity: O(n) (with n being the number of keys in the DB, and assuming keys and pattern of limited length)Returns all the keys matching the glob-style pattern asspace separated strings. For example if you have in thedatabase the keys "foo" and "foobar" the command "KEYS foo*"will return "foo foobar".
+Note that while the time complexity for this operation is O(n)the constant times are pretty low. For example Redis runningon an entry level laptop can scan a 1 million keys databasein 40 milliseconds. Still it's better to consider this one of ++the slow commands that may ruin the DB performance if not usedwith care*.+In other words this command is intended only for debugging and *special* operations like creating a script to change the DB schema. Don't use it in your normal code. Use Redis Sets in order to group together a subset of objects.+Glob style patterns examples: +* h?llo will match hello hallo hhllo* h*llo will match hllo heeeello* hUse \ to escape special chars if you want to match them verbatim.[ae]llo will match hello and hallo, but not hilloReturn value
Bulk reply, specifically a string in the form of space separated list of keys. Note that most client libraries will return an Array of keys and not a single string with space separated keys (that is, split by " " is performed in the client library usually).