filterExactCommands
fun <T : BaseSentMessageUpdate> Flow<T>.filterExactCommands(commandRegex: Regex): Flow<ContentMessage<TextContent>>
Convert incoming dev.inmo.tgbotapi.types.message.abstracts.ContentMessage.content of messages with fullEntitiesList and check that incoming message contains ONLY ONE TextSource and that is BotCommandTextSource. Besides, it is checking that BotCommandTextSource.command with incoming commandRegex
Return
The same message in case if it contains only BotCommandTextSource with Regex.matches