From 9b7f3ebbb1bfbea4e154f408e29243f38c1b1ea3 Mon Sep 17 00:00:00 2001
From: Shigma <1700011071@pku.edu.cn>
Date: Wed, 14 Oct 2020 02:30:27 +0800
Subject: [PATCH] fix(teach): braces should not be stripped for regexp
 questions

---
 packages/plugin-teach/src/internal.ts | 6 ++++--
 packages/plugin-teach/src/receiver.ts | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/plugin-teach/src/internal.ts b/packages/plugin-teach/src/internal.ts
index 3dabeac6bc..16710a6759 100644
--- a/packages/plugin-teach/src/internal.ts
+++ b/packages/plugin-teach/src/internal.ts
@@ -59,11 +59,13 @@ export default function apply(ctx: Context, config: Dialogue.Config) {
       return Message.Teach.ProhibitedCQCode
     }
 
-    const { unprefixed, prefixed, appellative } = config._stripQuestion(options.question)
+    const { unprefixed, prefixed, appellative } = options.regexp
+      ? { unprefixed: question, prefixed: question, appellative: false }
+      : config._stripQuestion(question)
     argv.appellative = appellative
     Object.defineProperty(options, '_original', { value: prefixed })
     if (unprefixed) {
-      options.original = options.question
+      options.original = question
       options.question = unprefixed
     } else {
       delete options.question
diff --git a/packages/plugin-teach/src/receiver.ts b/packages/plugin-teach/src/receiver.ts
index 64f588c73f..5df7463f63 100644
--- a/packages/plugin-teach/src/receiver.ts
+++ b/packages/plugin-teach/src/receiver.ts
@@ -307,7 +307,7 @@ export default function (ctx: Context, config: Dialogue.Config) {
 }
 
 function prepareSource(source: string) {
-  return CQCode.stringifyAll(CQCode.parseAll(source || '').map((code, index, arr) => {
+  return CQCode.stringifyAll(CQCode.parseAll(source).map((code, index, arr) => {
     if (typeof code !== 'string') return code
     let message = simplify(CQCode.unescape('' + code))
       .toLowerCase()