docs: add simple search engine

docs/docs/configuration/search.md

@@ -8,11 +8,15 @@ sidebar_position: 3
 
 Click on the column header to sort by that column. Click again to reverse the sort order.
 
-Click on the search icon to open the search input field. Both `glob` and `regex` engines are available to search the current folder and all descendants of the current folder.
+Click on the search icon to open the search input field. All engines search the current folder and all descendants of the current folder.
+
+### Simple search
+
+Most intuitive string-matching search engine with basic functionality.
 
 ### Glob-based search
 
-This is the recommended search engine for most users. It is simple to use and faster than the regex engine.
+More powerful search engine for advanced users. It is simple to use and faster than the regex engine.
 
 | Pattern        | Description                                                                                                                                |
 |----------------|--------------------------------------------------------------------------------------------------------------------------------------------|
@@ -21,12 +25,20 @@ This is the recommended search engine for most users. It is simple to use and fa
 | `[...]`       | Matches one character from a group of characters. If the first character is `!`, it matches any character *not* in the group.              |
 | `\`           | Escapes the following character.                                                             |
 
-[Learn more](https://en.wikipedia.org/wiki/Glob_(programming))
+:::info
+Expansion `{a,b,c}` is not available because it is not supported by the underlying base image (Alpine Linux).
+
+Globestar `**` is not supported by PHP natively and might be implemented in the future.
+:::
+
+> [Learn more](https://en.wikipedia.org/wiki/Glob_(programming))
 
 ### Regex-based search
 
-[Learn more](https://en.wikipedia.org/wiki/Regular_expression)
+This engine is the most powerful but slower than the glob engine. It is useful for complex searches.
+
+> [Learn more](https://en.wikipedia.org/wiki/Regular_expression)
 
 import EnvConfig from '@site/src/components/EnvConfig';
 
-<EnvConfig name="SEARCH|SEARCH_ENGINE|SEARCH_MAX_DEPTH|SEARCH_MAX_RESULTS|REVERSE_SORT" init="true|glob|25|100|false" values="true,false|glob,regex|integer|integer|true,false" versions="3.7|3.7|3.7|3.7|1.0" desc="Enables or disables the search functionality|Search engine to evaluate query|Maximum recursive search depth (regex engine only)|Maximum number of results in a single request|By default files and folders are sorted by name using natural sort."/>
+<EnvConfig name="SEARCH|SEARCH_ENGINE|SEARCH_MAX_DEPTH|SEARCH_MAX_RESULTS|REVERSE_SORT" init="true|simple|25|100|false" values="true,false|simple,glob,regex|integer|integer|true,false" versions="3.7|3.7|3.7|3.7|1.0" desc="Enables or disables the search functionality|Search engine to evaluate query|Maximum recursive search depth (simple and regex engine only)|Maximum number of results in a single request|By default files and folders are sorted by name using natural sort."/>