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* Add aliases to all files Signed-off-by: Jack Baldry <jack.baldry@grafana.com> * Prettify front matter Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
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+++ aliases = ["/docs/grafana/latest/variables/variable-selection-options/"] title = "Variable selection options" weight = 400 +++
Configure variable selection options
Selection Options are a feature you can use to manage variable option selections. All selection options are optional, and they are off by default.
Multi-value
If you turn this on, then the variable dropdown list allows users to select multiple options at the same time. For more information, refer to [Formatting multi-value variables]({{< relref "formatting-multi-value-variables.md" >}}).
Include All option
Grafana adds an All option to the variable dropdown list. If a user selects this option, then all variable options are selected.
Custom all value
This option is only visible if the Include All option is selected.
Enter regex, globs, or lucene syntax in the Custom all value field to define the value of the All option.
By default the All value includes all options in combined expression. This can become very long and can have performance problems. Sometimes it can be better to specify a custom all value, like a wildcard regex.
In order to have custom regex, globs, or lucene syntax in the Custom all value option, it is never escaped so you will have to think about what is a valid value for your data source.