This filter checks if the given user variable exists and has a specific value.
Define the general settings for enhanced filters: negation, filter name, and filter description. See General filter settings.
1.Variable
Enter the name of the variable. You should enter the variable name in an expression in this form: “%user:XYZ%”. You can use RegEx. The icon 
opens the RegEx Editor.
2.Value
Enter an expression that must match the value of the user variable found. With this regular expression .*, this filter can check whether a given user variable exists with any value.
