src/vs/platform/userDataSync/common/extensionsStorageSync.ts/ExtensionsStorageSyncService/fromKey
class ExtensionsStorageSyncService:	private static fromKey(key: string): IExtensionIdWithVersion | undefined {
		const matches = EXTENSION_KEYS_ID_VERSION_REGEX.exec(key);
		if (matches && matches[1]) {
			return { id: matches[1], version: matches[2] };
		}
		return undefined;
	}