Notepad++ - new User Defined Language system (UDL2). UDL (User Defined Language) is one of most important features in Notepad++. In v6.2, much better UDL system (UDL2). Not only many restrictions/limitations in UDL are removed, but also a lot of new features/enhancements are added in UDL2. In fact, you can almost define any language with it.

Based on the powerful editing component Scintilla, Notepad++ is written in C++ and uses pure Win32 API and STL which ensures a higher execution speed and smaller program size. By optimizing as many routines as possible without losing user friendliness, Notepad++ is trying to reduce the world carbon dioxide emissions. When using less CPU power, the PC can throttle down and reduce power consumption, resulting in a greener environment.

It's the handy Notepad++ text editor packaged as a portable app so you can do your development on the go. It has all the same great features of Notepad++ including support for multiple languages and an extensive plugin system, but there's nothing to install.

It also gives the extra functionality to the general user: colorize the user defined words. You can print your source code in color (or whatever you want) if you have a color printer (WYSIWYG). Furthermore, Notepad++ includes the multi-view feature, which allows the user to edit the different documents at the same time, and even edit the same document synchronously in 2 different views.

Notepad++ supports drag and drop: not only you can drop the file from explorer to open it, but also you can drag and drop a document from a view to another. With all the functionalities, Notepad++ runs as fast as Notepad provided by MS Windows.

Features
* Syntax Highlighting and Syntax Folding (C, C++, HTML, ASP, Java, Pascal, CSS and more)
* User Defined Syntax Highlighting
* PCRE (Perl Compatible Regular Expression) Search/Replace
* GUI entirely customizable: minimalist, tab with close button, multi-line tab, vertical tab and vertical document list
* Auto-completion: Word completion, Function completion and Function parameters hint
* Multi-Document (Tab interface)
* Multi-View
* Document Map
* Full Drag ‘N Drop supported
* Zoom in and zoom out
* Multi-Language environment supported
* Brace and Indent guideline Highlighting
* Macro recording and playback
* Session snapshot & periodic backup.
* WYSIWYG (Printing)
* Multi-Language environment supported
* Bookmark
* Macro recording and playback
* Launch with different arguments
If this feature is enabled (enabled by default), user won't be asked to save unsaved file as he quits Notepad++, and on startup Notepad++ restores the unsaved file and unsaved untitled document of last session.
This feature brings another advantage - periodic backup of unsaved files which protects your data from the PC crashing or power outage.
You can always turn off this feature to get back the old behaviour.

The key features of UDL2
UDL (User Defined Language) is one of most important features in Notepad++.
In v6.2, much better UDL system (UDL2) is provided by Ivan Radic (aka Loreia). Not only many restrictions/limitations in UDL are removed, but also a lot of new features/enhancements are added in UDL2. In fact, you can almost define any language with it.
1. More keyword groups were added (more syntax highlighting can be defined):
- 3 folding groups
- 8 keyword groups
- 2 comment groups
- 1 number definitons
- 2 operators groups
- 8 delimiter sets
2. Multipart keywords are supported (for example: "else if" can be defined as a single keyword)
3. Whitespace is no longer mandatory as keyword separator: Operators, Delimiters and Folding keywords can be recognized with or without whitespace separators.
4. Numbers recognition support is greatly improved (prefix, suffix, range and extra symbols supported).
5. Operators and delimiters can be longer than one character.
6. The same characters can be used as comments AND operators.
7. Comments and delimiters support nesting (even within each other).
8. Improvments to Comments include:
- Comment folding
- Comment continuation
- Comment only start at the beginning of line
9. In the case of several comment pairs defined, comment open symbols match only with comment close symbols of the same order. (for example: /* C comment */, /+ D comment +/, but not /* mixed comment +/)

Included plugins (Unicode): Compare, Convertor, DSpellCheck, Explorer, Light Explorer, Spell Checker, Mime Tool, NppExport, NppFTP, Plugin Manager

Supported programming languages
ASP, Ada, ASCII art, Assembler, AutoIt, BAT, C, C#, C++, Caml, CSS, doxygen, FORTRAN, HTML, Haskell, Java, javascript, KiXtart, Lisp, Lua, makefile, Matlab, Objective-C, Pascal, Perl, PHP, PostScript, Python, Ruby, Scheme, Unix Shell Script, Smalltalk, SQL, Tcl, TeX, Verilog, VHDL, VB/VBScript, XML.

Notepad++ 6.8.4 (Oct 16, 2015):
* Improve document switching performance while folding restoring.
* Enhance Javascript syntax highlighting: 2 groups of keywords more for syntax highlighting customization.
* Improve auto-insert usability: the open symbols (", ', (, [ and { ) triggers the close symbols according to the context.
* Apply new added language auto-detection (for php, xml, html and bash) in the case of unknown file extension.
* Add JSON language support.
* Fix macro playback inserting/removing characters randomly.
* Fix Save All button is still enabled problem while no file to save.
* Make file save dialog modern style.
* Fix auto-insert for xml comment incorrect insertion.
* Fix user command save problem on exit.
* Fix macro save problem on exit.
* Fix the restoring from system tray problem while running in admin mode.
* Fix smart highlighting not working in some case.
* Enlarge tabbar height.