data class Matcher (source)
Matcher(language: String? = null, appId: String? = null, regions: List<String>? = null, version: String? = null, manufacturer: String? = null, device: String? = null, country: String? = null, releaseChannel: String? = null) | 
val appId: String?
id (package name) of the expected application, as a regex  | 
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val country: String?
Required country, as a three-letter abbreviation  | 
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val device: String?
Required device model, as a regex  | 
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val language: String?
Language of the device, as a regex  | 
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val manufacturer: String?
Required device manufacturer, as a regex  | 
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val regions: List<String>?
Regions where the experiment should be enabled  | 
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val releaseChannel: String?
Required app release channel (alpha, beta, ...), as a regex  | 
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val version: String?
Required app version, as a regex  |