In order to accommodate granting rights to users from arbitrary hosts, MySQL supports specifying the user_name value in the form user@host. If you want to specify a user string containing special characters (such as `-'), or a host string containing special characters or wildcard characters (such as `%'), you can quote the user or host name (for example, 'test-user'@'test-hostname').
You can specify wildcards in the hostname. For example, user@'%.loc.gov' applies to user for any host in the loc.gov domain, and user@'144.155.166.%' applies to user for any host in the 144.155.166 class C subnet.
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