Leafpad is the default GUI text editor for CrunchBang Lite, accessible from the menu under 'Text Editor', it also has the keybinding W-e (Windows/superkey-e) assigned to it. It is extremely light weight but has few features, (think notepad in windows).
Leafpad has very few features, most are under 'Options' in the top level menu including:
Leafpad also features Search and Replace, available under 'Search' in the top level menu. From here you can use find to 'find' specific text, or 'replace' to replace it.