diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 0e4cfb8b6..6b5ff9e46 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -5,6 +5,7 @@
 
 **2020/09/21**
 * 修复规则解析bug
+* 换源时无最新章节信息时可加载详情页来获取(默认关闭)
 
 **2020/09/20**
 * 优化正文搜索
diff --git a/app/src/main/java/io/legado/app/constant/PreferKey.kt b/app/src/main/java/io/legado/app/constant/PreferKey.kt
index 3e89dd2e2..7ef56460e 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -33,8 +33,9 @@ object PreferKey {
     const val webDavAccount = "web_dav_account"
     const val webDavPassword = "web_dav_password"
     const val webDavCreateDir = "webDavCreateDir"
-    const val webDavExport = "webDavExport"
+    const val webDavCacheBackup = "webDavCacheBackup"
     const val changeSourceLoadToc = "changeSourceLoadToc"
+    const val changeSourceLoadInfo = "changeSourceLoadInfo"
     const val chineseConverterType = "chineseConverterType"
     const val launcherIcon = "launcherIcon"
     const val textSelectAble = "selectText"
diff --git a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
index 327ed5fda..407bcf2c5 100644
--- a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
+++ b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
@@ -125,13 +125,13 @@ object WebDavHelp {
     fun exportWebDav(path: String, fileName: String) {
         try {
             if (initWebDav()) {
-                //默认导出到legado文件夹下exports目录
+                // 默认导出到legado文件夹下exports目录
                 val exportsWebDavUrl = rootWebDavUrl + EncoderUtils.escape("exports") + "/"
-                //在legado文件夹创建exports目录,如果不存在的话
+                // 在legado文件夹创建exports目录,如果不存在的话
                 WebDav(exportsWebDavUrl).makeAsDir()
                 val file = File("${path}${File.separator}${fileName}")
-                //如果导出的本地文件存在,开始上传
-                if(file.exists()){
+                // 如果导出的本地文件存在,开始上传
+                if(file.exists()) {
                     val putUrl = exportsWebDavUrl + fileName
                     WebDav(putUrl).upload("${path}${File.separator}${fileName}")
                 }
diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
index 81dfe2f61..29c0f5473 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
@@ -458,7 +458,7 @@ class AnalyzeRule(var book: BaseBook? = null) : JsExtensions {
                 }
                 tmp = evalMatcher.group()
                 when {
-                    tmp.startsWith("$") && !rule.contains("##") -> {
+                    tmp.startsWith("$") -> {
                         ruleType.add(tmp.substring(1).toInt())
                         ruleParam.add(tmp)
                     }
diff --git a/app/src/main/java/io/legado/app/service/help/ReadBook.kt b/app/src/main/java/io/legado/app/service/help/ReadBook.kt
index 2e96221f3..479850620 100644
--- a/app/src/main/java/io/legado/app/service/help/ReadBook.kt
+++ b/app/src/main/java/io/legado/app/service/help/ReadBook.kt
@@ -368,7 +368,19 @@ object ReadBook {
         val currentLine = currentPage.textLines[lineIndex]
         length -= currentLine.text.length
         val charIndex = contentPosition - length
-        return arrayOf(pageIndex, lineIndex, charIndex)
+        var addLine = 0
+        var charIndex2 = 0
+        // change line
+        if ((charIndex + query.length) > currentLine.text.length){
+            addLine = 1
+            charIndex2 = charIndex + query.length - currentLine.text.length - 1
+        }
+        // changePage
+        if ((lineIndex + addLine + 1) > currentPage.textLines.size){
+            addLine = -1
+            charIndex2 = charIndex + query.length - currentLine.text.length - 1
+        }
+        return arrayOf(pageIndex, lineIndex, charIndex, addLine, charIndex2)
     }
 
     /**
diff --git a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
index afc78bc37..52e26862c 100644
--- a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
@@ -40,15 +40,14 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         val content = getAllContents(book)
         DocumentUtils.createFileIfNotExist(doc, filename)
             ?.writeText(context, content)
-        if(App.INSTANCE.getPrefBoolean(PreferKey.webDavExport,false)) {
-            //写出文件到cache目录
+        if(App.INSTANCE.getPrefBoolean(PreferKey.webDavCacheBackup,false)) {
             FileUtils.createFileIfNotExist(
                 File(FileUtils.getCachePath()),
                 filename
-            ).writeText(content)
-            //导出到webdav
+            ).writeText(content) // 写出文件到cache目录
+            // 导出到webdav
             WebDavHelp.exportWebDav(FileUtils.getCachePath(), filename)
-            //上传完删除cache文件
+            // 上传完删除cache文件
             FileUtils.deleteFile("${FileUtils.getCachePath()}${File.separator}${filename}")
         }
         App.db.bookChapterDao().getChapterList(book.bookUrl).forEach { chapter ->
@@ -79,8 +78,8 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         val filename = "${book.name} by ${book.author}.txt"
         FileUtils.createFileIfNotExist(file, filename)
             .writeText(getAllContents(book))
-        if(App.INSTANCE.getPrefBoolean(PreferKey.webDavExport,false)) {
-            WebDavHelp.exportWebDav(file.absolutePath, filename)//导出到webdav
+        if(App.INSTANCE.getPrefBoolean(PreferKey.webDavCacheBackup,false)) {
+            WebDavHelp.exportWebDav(file.absolutePath, filename) // 导出到webdav
         }
         App.db.bookChapterDao().getChapterList(book.bookUrl).forEach { chapter ->
             BookHelp.getContent(book, chapter).let { content ->
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceDialog.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceDialog.kt
index bbd627466..e73b443a6 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceDialog.kt
@@ -88,6 +88,8 @@ class ChangeSourceDialog : BaseDialogFragment(),
         tool_bar.setOnMenuItemClickListener(this)
         tool_bar.menu.findItem(R.id.menu_load_toc)?.isChecked =
             getPrefBoolean(PreferKey.changeSourceLoadToc)
+        tool_bar.menu.findItem(R.id.menu_load_info)?.isChecked =
+            getPrefBoolean(PreferKey.changeSourceLoadInfo)
     }
 
     private fun initRecyclerView() {
@@ -159,6 +161,10 @@ class ChangeSourceDialog : BaseDialogFragment(),
                 putPrefBoolean(PreferKey.changeSourceLoadToc, !item.isChecked)
                 item.isChecked = !item.isChecked
             }
+            R.id.menu_load_info -> {
+                putPrefBoolean(PreferKey.changeSourceLoadInfo, !item.isChecked)
+                item.isChecked = !item.isChecked
+            }
             R.id.menu_stop -> viewModel.stopSearch()
         }
         return false
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
index ec423c3dd..0cbc1e2ee 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
@@ -120,11 +120,11 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
                 .onSuccess(IO) {
                     it.forEach { searchBook ->
                         if (searchBook.name == name && searchBook.author == author) {
-                            if (context.getPrefBoolean(PreferKey.changeSourceLoadToc)) {
-                                if (searchBook.tocUrl.isEmpty()) {
+                            if (searchBook.latestChapterTitle.isNullOrEmpty()) {
+                                if (context.getPrefBoolean(PreferKey.changeSourceLoadInfo) || context.getPrefBoolean(PreferKey.changeSourceLoadToc)) {
                                     loadBookInfo(searchBook.toBook())
                                 } else {
-                                    loadChapter(searchBook.toBook())
+                                    searchFinish(searchBook)
                                 }
                             } else {
                                 searchFinish(searchBook)
@@ -156,7 +156,14 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
             App.db.bookSourceDao().getBookSource(book.origin)?.let { bookSource ->
                 WebBook(bookSource).getBookInfo(book, this)
                     .onSuccess {
-                        loadChapter(it)
+                        if (context.getPrefBoolean(PreferKey.changeSourceLoadToc)) {
+                            loadChapter(it)
+                        } else {
+                            //从详情页里获取最新章节
+                            book.latestChapterTitle = it.latestChapterTitle
+                            val searchBook = book.toSearchBook()
+                            searchFinish(searchBook)
+                        }
                     }.onError {
                         debug { context.getString(R.string.error_get_book_info) }
                     }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 53a549425..92df11f6a 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -9,6 +9,7 @@ import android.graphics.drawable.ColorDrawable
 import android.net.Uri
 import android.os.Bundle
 import android.os.Handler
+import android.util.Log
 import android.view.*
 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import androidx.core.view.get
@@ -56,16 +57,14 @@ import io.legado.app.ui.widget.dialog.TextDialog
 import io.legado.app.utils.*
 import kotlinx.android.synthetic.main.activity_book_read.*
 import kotlinx.android.synthetic.main.view_read_menu.*
-import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
-import kotlinx.coroutines.async
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
 import org.jetbrains.anko.sdk27.listeners.onClick
 import org.jetbrains.anko.startActivity
 import org.jetbrains.anko.startActivityForResult
 import org.jetbrains.anko.toast
+import java.lang.Runnable
 
 class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_book_read),
     View.OnTouchListener,
@@ -789,14 +788,22 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
                                 pages = ReadBook.curTextChapter?.pages
                             }
                             val positions = ReadBook.searchResultPositions(pages, indexWithinChapter, query!!)
-                            //todo: show selected text
-                            val job1 = async(Main){
+                            while (ReadBook.durPageIndex != positions[0]){
+                                delay(100L)
                                 ReadBook.skipToPage(positions[0])
-                                page_view.curPage.selectStartMoveIndex(positions[0], positions[1], 0)
-                                page_view.curPage.selectEndMoveIndex(positions[0], positions[1], 0 + query.length )
+                            }
+                            withContext(Main){
+                                page_view.curPage.selectStartMoveIndex(0, positions[1], positions[2])
+                                delay(20L)
+                                when (positions[3]){
+                                    0 -> page_view.curPage.selectEndMoveIndex(0, positions[1], positions[2] + query.length - 1)
+                                    1 -> page_view.curPage.selectEndMoveIndex(0, positions[1] + 1, positions[4])
+                                    //todo: consider change page, jump to scroll position
+                                    -1 -> page_view.curPage.selectEndMoveIndex(1, 0, positions[4])
+                                }
                                 page_view.isTextSelected = true
+                                delay(100L)
                             }
-                            job1.await()
                         }
                     }
                 requestCodeReplace -> onReplaceRuleSave()
diff --git a/app/src/main/res/menu/change_source.xml b/app/src/main/res/menu/change_source.xml
index ab2bfee4c..dd2deae1b 100644
--- a/app/src/main/res/menu/change_source.xml
+++ b/app/src/main/res/menu/change_source.xml
@@ -24,4 +24,10 @@
         android:checkable="true"
         app:showAsAction="never" />
 
+    <item
+        android:id="@+id/menu_load_info"
+        android:title="@string/load_info"
+        android:checkable="true"
+        app:showAsAction="never" />
+
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index 5990fc38a..4d38941b5 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -10,8 +10,8 @@
     <string name="menu_import_old">導入閲讀數據</string>
     <string name="mkdirs">創建子文件夾</string>
     <string name="mkdirs_description">創建 legado 文件夾作爲備份路徑</string>
-    <string name="export_webdav">離線導出WebDav</string>
-    <string name="export_webdav_s">默認導出到legado文件夾下exports目錄</string>
+    <string name="webdav_cache_backup">離線緩存書籍備份</string>
+    <string name="webdav_cache_backup_s">導出本地同時備份到legado文件夾下exports目錄</string>
     <string name="backup_path">備份路徑</string>
     <string name="menu_import_old_version">導入舊版數據</string>
     <string name="menu_import_github">導入 Github 數據</string>
@@ -568,6 +568,7 @@
     <string name="export_selection">導出所選</string>
     <string name="export">導出</string>
     <string name="load_toc">加載目錄</string>
+    <string name="load_info">加載詳情頁</string>
     <string name="tts">TTS</string>
     <string name="web_dav_pw">WebDav 密碼</string>
     <string name="web_dav_pw_s">輸入你的 WebDav 授權密碼</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index bab0077cc..6335186ca 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -10,8 +10,8 @@
     <string name="menu_import_old">匯入閱讀資料</string>
     <string name="mkdirs">建立子資料夾</string>
     <string name="mkdirs_description">建立legado資料夾作為備份資料夾</string>
-    <string name="export_webdav">離線導出WebDav</string>
-    <string name="export_webdav_s">默認導出到legado文件夾下exports目錄</string>
+    <string name="webdav_cache_backup">離線緩存書籍備份</string>
+    <string name="webdav_cache_backup_s">導出本地同時備份到legado文件夾下exports目錄</string>
     <string name="backup_path">備份路徑</string>
     <string name="menu_import_old_version">匯入舊版資料</string>
     <string name="menu_import_github">匯入Github資料</string>
@@ -569,6 +569,7 @@
     <string name="export_selection">匯出所選</string>
     <string name="export">匯出</string>
     <string name="load_toc">載入目錄</string>
+    <string name="load_info">載入詳情頁</string>
     <string name="tts">TTS</string>
     <string name="web_dav_pw">WebDav 密碼</string>
     <string name="web_dav_pw_s">輸入你的WebDav授權密碼</string>
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index edabcafce..92977d3f5 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -10,8 +10,8 @@
     <string name="menu_import_old">导入阅读数据</string>
     <string name="mkdirs">创建子文件夹</string>
     <string name="mkdirs_description">创建legado文件夹作为备份文件夹</string>
-    <string name="export_webdav">离线导出WebDav</string>
-    <string name="export_webdav_s">默认导出到legado文件夹下exports目录</string>
+    <string name="webdav_cache_backup">离线缓存书籍备份</string>
+    <string name="webdav_cache_backup_s">导出本地同时备份到legado文件夹下exports目录</string>
     <string name="backup_path">备份路径</string>
     <string name="select_backup_path">请选择备份路径</string>
     <string name="menu_import_old_version">导入旧版数据</string>
@@ -575,6 +575,7 @@
     <string name="export_selection">导出所选</string>
     <string name="export">导出</string>
     <string name="load_toc">加载目录</string>
+    <string name="load_info">加载详情页</string>
     <string name="tts">TTS</string>
     <string name="web_dav_pw">WebDav 密码</string>
     <string name="web_dav_pw_s">输入你的WebDav授权密码</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 515c117b2..4779b5909 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -10,8 +10,8 @@
     <string name="menu_import_old">Import Legado data</string>
     <string name="mkdirs">Create a subfolder</string>
     <string name="mkdirs_description">Create a folder named Legado as the backup folder.</string>
-    <string name="export_webdav">Export Webdav</string>
-    <string name="export_webdav_s">Default export to the exports directory under the legado folder</string>
+    <string name="webdav_cache_backup">Offline cache book backup</string>
+    <string name="webdav_cache_backup_s">Export to local and back up to the exports directory under the legado folder</string>
     <string name="backup_path">Backup to</string>
     <string name="select_backup_path">Please select a backup path.</string>
     <string name="menu_import_old_version">Import legacy data</string>
@@ -577,6 +577,7 @@
     <string name="export_selection">Export selected</string>
     <string name="export">Export</string>
     <string name="load_toc">Load chapters</string>
+    <string name="load_info">Load book detail</string>
     <string name="tts">TTS</string>
     <string name="web_dav_pw">WebDav password</string>
     <string name="web_dav_pw_s">Input you WebDav authorized password</string>
diff --git a/app/src/main/res/xml/pref_config_backup.xml b/app/src/main/res/xml/pref_config_backup.xml
index 1d0ee0a9d..dc5ec4f37 100644
--- a/app/src/main/res/xml/pref_config_backup.xml
+++ b/app/src/main/res/xml/pref_config_backup.xml
@@ -39,8 +39,8 @@
         <io.legado.app.ui.widget.prefs.SwitchPreference
             android:key="webDavExport"
             android:defaultValue="false"
-            android:title="@string/export_webdav"
-            android:summary="@string/export_webdav_s"
+            android:title="@string/webdav_cache_backup"
+            android:summary="@string/webdav_cache_backup_s"
             app:allowDividerAbove="false"
             app:allowDividerBelow="false"
             app:iconSpaceReserved="false" />