英文:
Regular expression at switch case
问题
我需要编写一个简单的Telegram机器人。除了一个问题，其他都正常工作。当我输入命令\任务#1时，它应该给我提供相应的链接，\任务#2应该给我提供相应的链接，以此类推。如何更好地安排这个问题，或者如何为正则表达式制作switch case？
import (
"log"
"strconv"
"github.com/go-telegram-bot-api/telegram-bot-api"
)
func main() {
bot, err := tgbotapi.NewBotAPI("")
tasks := [...]string{"Ansible assignment", "Bash script"}
links := [...]string{"https://github.com/task1", "https://github.com/task2"}
if err != nil {
log.Panic(err)
}
bot.Debug = true
log.Printf("Authorized on account %s", bot.Self.UserName)
u := tgbotapi.NewUpdate(0)
u.Timeout = 60
updates, err := bot.GetUpdatesChan(u)
for update := range updates {
if update.Message == nil { // ignore any non-Message Updates
continue
}
log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)
if update.Message.IsCommand() {
msg := tgbotapi.NewMessage(update.Message.Chat.ID, "")
switch update.Message.Command() {
case "help":
msg.Text = "type /sayhi or /status."
case "homerep":
msg.Text = "https://github.com/ :)"
case "tasks":
msg.ParseMode = "html"
msg.Text = "The list of completed tasks:\n"
for i := 0; i < len(tasks); i++ {
msg.Text = msg.Text + strconv.Itoa(i+1) + ". " + tasks[i] + " - " + "<a href='" + links[i] + "'><b>link</b></a>" + "\n"
}
case "task#":
msg.ParseMode = "html"
msg.Text = "This is test"
default:
msg.Text = "I don't know that command"
}
bot.Send(msg)
}
}
}
英文:
I need to write a simple telegram bot.
Everything is working except 1 thing. When I'm writing command \task#1 - it should give me the link for it, \task#2 - should give the link to task2, etc.
How to arrange this better or how to make switch case for regular expression?
import (
"log"
"strconv"
// "regexp"
"github.com/go-telegram-bot-api/telegram-bot-api"
)
func main() {
bot, err := tgbotapi.NewBotAPI("")
tasks := [...]string{"Ansible assignment", "Bash script"}
links := [...]string{"https://github.com/task1", "https://github.com/task2"}
// var currentTask = regexp.MustCompile(`^task#.`)
if err != nil {
log.Panic(err)
}
bot.Debug = true
log.Printf("Authorized on account %s", bot.Self.UserName)
u := tgbotapi.NewUpdate(0)
u.Timeout = 60
updates, err := bot.GetUpdatesChan(u)
for update := range updates {
if update.Message == nil { // ignore any non-Message Updates
continue
}
log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)
if update.Message.IsCommand() {
msg := tgbotapi.NewMessage(update.Message.Chat.ID, "")
switch update.Message.Command() {
case "help":
msg.Text = "type /sayhi or /status."
case "homerep":
msg.Text = "https://github.com/ :)"
case "tasks":
msg.ParseMode = "html"
msg.Text = "The list of completed tasks:\n"
for i := 0; i < len(tasks); i++ {
msg.Text = msg.Text + strconv.Itoa(i+1) + ". " + tasks[i] + " - " + "<a href='"+links[i] +"'> <b>link</b></a>" + "\n"
}
case update.Message.Command == "^task#.":
msg.ParseMode = "html"
msg.Text = "This is test"
default:
msg.Text = "I don't know that command"
}
bot.Send(msg)
}
}
}```
</details>
# 答案1
**得分**: 4
将正则表达式编译并分配给一个包级变量：
```go
var commandPat = regexp.MustCompile(`^task#.`)
修改 switch 语句以使用表达式。使用 MatchString 来进行正则表达式匹配：
switch cmd := update.Message.Command(); { // 注意这一行上的分号！
case cmd == "help":
...
case cmd == "homerep":
...
case cmd == "tasks":
...
case commandPat.MatchString(cmd):
...
英文:
Compile the regular expression and assign it to a package-level variable:
var commandPat = regexp.MustCompile(`^task#.`)
Modify the switch to use expressions. Use MatchString for the regular expression:
switch cmd := update.Message.Command(); { // note the ; on this line!
case cmd == "help":
...
case cmd == "homerep":
...
case cmd == "tasks":
...
case commandPat.MatchString(cmd):
...
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