Port "Search" page

Issue: #175

docs/site/content/_index.en.md

@@ -11,7 +11,7 @@ live from a device or an emulator, or log and dumpstate files.
 
 * [Display logs from a device or an emulator](/adb_mode)
 * Display saved logs and dumpstate files
-* Search in the logs using regex if needed
+* [Search in the logs using regex if needed](/search)
 * Filter log lines by tag, PID, log priority, message content
   * Filtered lines can be hidden, highlighted or shown in a separate window
 * Bookmarks

docs/site/content/adb_mode/_index.en.md

@@ -1,6 +1,6 @@
 ---
 title: Working with a device or an emulator
-weight: 30
+weight: 20
 ---
 AndLogView can display logs directly from an emulator or a device if you have
 the Android SDK installed. Simply run a launching script and the AndLogView

docs/site/content/install/_index.en.md

@@ -1,6 +1,6 @@
 ---
-title: Installation
-weight: 20
+title: Installing
+weight: 10
 ---
 
 ## Requirements

docs/site/content/search/_index.en.md

@@ -0,0 +1,70 @@
+---
+title: Searching
+weight: 30
+---
+You can search for the pattern occurences in tag, application name, and message
+fields.
+Press <kbd><kbd>Ctrl</kbd><kbd>F</kbd></kbd>, enter the pattern in the appeared
+text field and press <kbd><kbd>Enter</kbd></kbd> to start searching.
+
+![Search field](search_field.png)
+
+Search starts from the current selected log line of from the beginning if no line is selected.
+
+All occurences of the pattern are highlighted (and in the tooltip too)
+
+![Search results](search_results.png)
+
+Use <kbd><kbd>F3</kbd></kbd> and <kbd><kbd>Shift</kbd><kbd>F3</kbd></kbd> to navigate between search result forward and backward.
+
+If there is no more occurences of the pattern in the given direction from the
+selected line then the message appears in the status bar.
+
+![Search showing "Text not found"](search_not_found.png)
+
+Use <kbd><kbd>Esc</kbd></kbd> to stop search and clear highlighting.
+
+Simple text search is case-insesitive.
+
+## Regular expressions
+
+You can search using regular expressions. To do that wrap your pattern in
+slashes (`/.../`). For example, `/^[Aa]/` looks up all lines that start with
+lower or upper 'a'.
+
+Regex-based search is case-sensitive.
+
+Standard [Java regular expression syntax][java_pattern] is used.
+
+<!-- TODO(mlopatkin) link to filtering page when it is ready -->
+You can use regular expressions in tag, application name, and message filters
+too.
+
+## Limiting search scope
+
+By default, all available searchable fields (tag, application name, and message)
+are looked for matches. You can limit the scope with a prefix:
+
+- `tag:` to only look in tags
+- `app:` to only look in application names
+- `msg:` to only look in messages
+
+For example, when searching for `app:android`, messages that contain `android`
+aren't highlighted:
+![Search with prefix](search_with_prefix.png)
+
+
+Only a single prefix is supported, so you cannot specify, for example,
+`app:tag:foo` to look in both app names and tags. In fact, `tag:` would be
+treated as part of the search pattern.
+
+Regular expression can also be prefixed, like `tag:/(Foo|Bar)/`.
+
+## Limitations
+
+It is not possible to use simple search to search for spaces, tabs or other
+blank characters. Should you need this, you can use regular expression search as
+a workaround: `/[ ]/`. Note that using just space inside slashes, like `/ /`
+doesn't work too, as blank regular expressions are not supported.
+
+[java_pattern]: http://download.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html