Remove a redundant information

And add a new info in RegExpr Search

Author: donho

content/docs/config-files.md

@@ -153,11 +153,8 @@ The following sections are defined:
 3. `<History>`: the list of recently used files.
 3. `<ProjectPanels>`: associates workspace files with a given project panel
 
-*Note:* (new to v7.8.3) The command line interpreter that is invoked by "Open Containing Folder in cmd" and "CMD here" can be changed in the `<GUIConfigs>` section. For example, add the following line to set the cli to *powershell*
+There are some non-UI options for advanced users, please check [**Preferences for Advanced Users**](../preferences/#preferences-for-advanced-users) to get more details.
 
-    <GUIConfig name="commandLineInterpreter">powershell</GUIConfig>
-
-In principle, any command that can be found in your PATH can be used, but starting up an MSYS/MinGW-like environment usually requires more than just running *bash* or *zsh*. This also applies if you want to start your favorite cli in a *conhost* emulator like ConEmu.
 
 ## Keyword lists: `langs.xml`
 

content/docs/preferences.md

@@ -319,13 +319,13 @@ The following settings are for rather specific needs and could cause some confus
 ```
 <FindHistory nbMaxFindHistoryPath="10" nbMaxFindHistoryFilter="10" nbMaxFindHistoryFind="10" nbMaxFindHistoryReplace="10" matchWord="no" matchCase="no" wrap="yes" directionDown="yes" fifRecuisive="yes" fifInHiddenFolder="no" dlgAlwaysVisible="no" fifFilterFollowsDoc="no" fifFolderFollowsDoc="no" searchMode="0" transparencyMode="1" transparency="150" dotMatchesNewline="no" isSearch2ButtonsMode="yes" "regexBackward4PowerUser"="yes">
 ```
-    Simply add `"regexBackward4PowerUser"="yes"` if this option is absent.
+Simply add `"regexBackward4PowerUser"="yes"` if this option is absent.
 
 * Changing the command-line interpreter used: by default, **File > Open Containing Folder > cmd** will launch the `cmd.exe` command-line interpreter.  If you have a preferred command-line interpreter (such as `powershell`), you can add another `<GUIConfig...>` tag inside the `<GUIConfigs>` section:
 ```
 <GUIConfig name="commandLineInterpreter">powershell</GUIConfig>
 ```
-    If your command-line interpreter is not in your path, make sure to include the drive and folder in the contents of that tag.  If there are spaces, make sure to use quotes around the path:
+If your command-line interpreter is not in your path, make sure to include the drive and folder in the contents of that tag.  If there are spaces, make sure to use quotes around the path:
 ```
 <GUIConfig name="commandLineInterpreter">"c:\path\with spaces\to\cli.exe"</GUIConfig>
 ```

content/docs/searching.md

@@ -286,6 +286,8 @@ Notepad++ regular expressions use the Boost regular expression library v1.70, wh
 
 The Notepad++ Community has a [FAQ on other resources for regular expressions](https://notepad-plus-plus.org/community/topic/15765/faq-desk-where-to-find-regex-documentation).
 
+Note: Starting in v7.8.7, regex backward search is disallowed due to sometimes surprising results. If you really need this feature, please see [**Allow regex backward search**](../preferences/#preferences-for-advanced-users) to learn how to enable this option.
+
 ### Regex Special Characters
 
 In a regular expression (shortened into regex throughout), special characters interpreted are: