fix:修改niuniu插件at功能正则，提高兼容性 (#973)

Author: vatebur

plugin/niuniu/main.go

@@ -220,7 +220,7 @@ func init() {
 		ctx.SendChain(message.Reply(ctx.Event.GroupID),
 			message.Text("注册成功,你的牛牛现在有", u.Length, "cm"))
 	})
-	en.OnRegex(`jj\[CQ:at,qq=(\d+),name=[\s\S]*\]$`, getdb,
+	en.OnRegex(`^jj\s?(\[CQ:at,(?:\S*,)?qq=(\d+)(?:,\S*)?\]|(\d+))$`, getdb,
 		zero.OnlyGroup).SetBlock(true).Limit(func(ctx *zero.Ctx) *rate.Limiter {
 		lt := jjLimiter.Load(fmt.Sprintf("%d_%d", ctx.Event.GroupID, ctx.Event.UserID))
 		ctx.State["jj_last_touch"] = lt.LastTouch()
@@ -235,7 +235,8 @@ func init() {
 		})))
 	},
 	).Handle(func(ctx *zero.Ctx) {
-		adduser, err := strconv.ParseInt(ctx.State["regex_matched"].([]string)[1], 10, 64)
+		fiancee := ctx.State["regex_matched"].([]string)
+		adduser, err := strconv.ParseInt(fiancee[2]+fiancee[3], 10, 64)
 		if err != nil {
 			ctx.SendChain(message.Text("ERROR:", err))
 			return