Android packages may have underscores

var str = "mFocusedApp=AppWindowToken{41ac2030 token=Token{41797308
ActivityRecord{419b9290 u0 com.example.webviewapp_18_api/.MainActivity}}}";

// undefined
/mFocusedApp.+ ([a-zA-Z0-9\.]+)\/(\.?[^\}]+)\}/.exec(str)

Fix #1159