EmEditor

EmEditor is a lightweight text editor for Windows which supports Unicode (allowing for multi-language support). EmEditor allows you to quickly and easily open or edit huge files (up to 248GB or 2.1 billion lines), using a large file controller, and is optimized for speed and reliability. The program features JavaScript or VBScript macros, text encoding support (automatic encoding detection, Byte Order Mark support, file reload with a different encoding, detection of encoding errors), plug-ins, syntax highlighting (including embedded scripts in HTML, ASP, and PHP files), drag-and-drop, and menu and keyboard customizations.

• The new version allows you find/replace/filter a specified range of IPv4/IPv6 addresses. An IP address range can be specified as a number range syntax or an IPv4/IPv6 CIDR notation.
• Greatly improved the speed of Find/Replace/Filter, the Uppercase, Lowercase, Capitalize, Full-width, and Half-width commands using multi-threaded code even when temporary files are used to open very large files.
• Greatly improved the speed of the Save and Save As commands.
• Added the IP Address/CIDR notation check box/text box to the Enter Number Range dialog box.
• Added the Sort IPv4 Addresses Ascending, Sort IPv4 Addresses Descending, Sort IPv6 Addresses Ascending, and Sort IPv6 Addresses Descending radio buttons to the Sort by Multiple Columns dialog box.
• The new version allows you to enter a number larger than 4096 MB to the Maximum Memory Size per File text box in the Advanced page of the Customize dialog box (64-bit versions only).
• Added the SORT_IPV4 and SORT_IPV6 flags to the SORT_INFO structure and Editor_Sort inline function.
• Added the I (sorts IPv4 addresses) and P (sorts IPv6 addresses) options to the Sort method of the Document object.