Returns all the keys matching the glob-style pattern as space separated strings. For example if
you have in the database the keys "foo" and "foobar" the command "KEYS foo*" will return
"foo foobar".
<p>
Note that while the time complexity for this operation is O(n) the constant times are pretty
low. For example Redis running on an entry level laptop can scan a 1 million keys database in
40 milliseconds. <b>Still it's better to consider this one of the slow commands that may ruin
the DB performance if not used with care.</b>
<p>
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.
<p>
Glob style patterns examples:
<ul>
<li>h?llo will match hello hallo hhllo
<li>h*llo will match hllo heeeello
<li>haello will match hello and hallo, but not hillo
</ul>
<p>
Use \ to escape special chars if you want to match them verbatim.
<p>
Time complexity: O(n) (with n being the number of keys in the DB, and assuming keys and pattern
of limited length)
@param pattern
@return Multi bulk reply
Returns all the keys matching the glob-style pattern as space separated strings. For example if you have in the database the keys "foo" and "foobar" the command "KEYS foo*" will return "foo foobar". <p> Note that while the time complexity for this operation is O(n) the constant times are pretty low. For example Redis running on an entry level laptop can scan a 1 million keys database in 40 milliseconds. <b>Still it's better to consider this one of the slow commands that may ruin the DB performance if not used with care.</b> <p> 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. <p> Glob style patterns examples: <ul> <li>h?llo will match hello hallo hhllo <li>h*llo will match hllo heeeello <li>haello will match hello and hallo, but not hillo </ul> <p> Use \ to escape special chars if you want to match them verbatim. <p> Time complexity: O(n) (with n being the number of keys in the DB, and assuming keys and pattern of limited length) @param pattern @return Multi bulk reply