Programmer's Notepad
Programmer's Notepad (PN1) is an open-source text editor targeted at users who work with source code. It was released in 1998 by Echo Software (a trading name for Simon Steele). PN1's successor, Programmer's Notepad 2(PN2), was released in 2002 and is now based on Scintilla. PN2 adds to Scintilla's features by supporting multi-line regular expressions for search and replace actions.