enforce your android versionName format with a regexp

build.gradle

android {
    defaultConfig {
        // Version name format: A.B.C-D, with A, B, and C numbers with -D optional as either "ALPHA"
        // or "BETA" followed by a description. Examples: "1.0.0", "1.0.0-BETA",
        // "1.0.0-ALPHA-TACO-DELIVERY".
        versionName "1.0.0"
        // Enforce that the version name matches the required format.
        if (!(versionName ==~ /\d+\.\d+\.\d+(-(ALPHA|BETA).*)?/)) {
            throw new IllegalStateException(
                    "Invalid version name ('$versionName')! See comment in app/build.gradle")
        }
    }
}