docs: add library_search page

docs/library/library_search.md

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+# Library Search
+
+## Boolean Operators
+
+TagStudio allows you to use common [boolean search](https://en.wikipedia.org/wiki/Full-text_search#Boolean_queries) operators when searching your library, along with [grouping](#grouping-and-nesting), [nesting](#grouping-and-nesting), and [character escaping](#escaping-characters). Note that you may need to use grouping in order to get the desired results you're looking for.
+
+### AND
+
+The `AND` operator will only return results that match **both** sides of the operator. `AND` is used implicitly when no boolean operators are given. To use the `AND` operator explicitly, simply type "and" (case insensitive) in-between items of your search.
+
+> For example, searching for "Tag1 Tag2" will be treated the same as "Tag1 `AND` Tag2" and will only return results that contain both Tag1 and Tag2.
+
+### OR
+
+The `OR` operator will return results that match **either** the left or right side of the operator. To use the `OR` operator simply type "or" (case insensitive) in-between items of your search.
+
+> For example, searching for "Tag1 `OR` Tag2" will return results that contain either "Tag1", "Tag2", or both.
+
+### NOT
+
+The `NOT` operator will returns results where the condition on the right is **false.** To use the `NOT` operator simply type "not" (case insensitive) in-between items of your search. You can also begin your search with `NOT` to only view results that do not contain the next term that follows.
+
+> For example, searching for "Tag1 `NOT` Tag2" will only return results that contain "Tag1" while also not containing "Tag2".
+
+### Grouping and Nesting
+
+Searches can be grouped and nested by using parentheses to surround parts of your search query.
+
+> For example, searching for "(Tag1 `OR` Tag2) `AND` Tag3" will return results any results that contain Tag3, plus one or the other (or both) of Tag1 and Tag2.
+
+### Escaping Characters
+
+Sometimes search queries have ambiguous characters and need to be "escaped". This is most common with tag names which contain spaces, or overlap with existing search keywords such as "[path:](#filename--filepath) of exile". To escape most search terms, surround the section of your search in plain quotes. Alternatively, spaces in tag names can be replaced by underscores.
+
+#### Valid Escaped Tag Searches
+
+-   "Tag Name With Spaces"
+-   Tag_Name_With_Spaces
+
+#### Invalid Escaped Tag Searches
+
+-   Tag Name With Spaces
+    -   Reason: Ambiguity between a tag named "Tag Name With Spaces" and four individual tags called "Tag", "Name", "With", "Spaces".
+
+## Tags
+
+[Tag](#tags) search is the default mode of file entry search in TagStudio. No keyword prefix is required, however using `tag:` will also work. The tag search attempts to match tag [names](tag.md#name), [shorthands](tag.md#shorthand), [aliases](tag.md#aliases), as well as allows for tags to [substitute](tag.md#intuition-via-substitution) in for any of their [parent tags](tag.md#parent-tags).
+
+You may also see the `tag_id:` prefix keyword show up with using the right-click "Search for Tag" option on tags. This is meant for internal use, and eventually will not be displayed or accessible to the user.
+
+## Fields
+
+_[Field](field.md) search is currently not in the program, however is coming in a future version._
+
+## File Entry Search
+
+### Filename + Filepath
+
+Currently (v9.5.0-PR1) the filepath search uses [glob](<https://en.wikipedia.org/wiki/Glob_(programming)>) syntax, meaning you'll likely have to wrap your filename or partial filepath inside asterisks for results to appear. This search is also currently case sensitive. Use the `path:` keyword prefix followed by the filename or path, with asterisks surrounding partial names.
+
+#### Examples
+
+Given a file "artwork/piece.jpg", these searches will return results with it:
+
+-   `path: artwork/piece.jpg` _(Note how no asterisks are required if the full path is given)_
+-   `path: *piece.jpg*`
+-   `path: *artwork*`
+-   `path: *rtwor*`
+-   `path: *ece.jpg*`
+-   `path: *iec*`
+
+And these (currently) won't:
+
+-   `path: piece.jpg`
+-   `path: piece.jpg`
+-   `path: artwork`
+-   `path: rtwor`
+-   `path: ece.jpg`
+-   `path: iec`
+
+## Special Searches
+
+"Special" searches use the `special:` keyword prefix and give quick results for certain special search queries.
+
+### Untagged
+
+To see all your file entries which don't contain any tags, use the `special:untagged` search.
+
+### Empty
+
+**_NOTE:_** _Currently unavailable in v9.5.0-PR1_
+
+To see all your file entries which don't contain any tags _and_ any fields, use the `special:empty` search.