text editor wars.

because text editors are just as important as browsers.

gedit:
- pros: tabs [!!!!], syntax highlighting
- cons: none that i care about.

notepad:
- pros: it's a text editor?
- cons: lack of features.

notepad2:
- pros: syntax highlighting, line numbering, organized interface, find/replace
- cons: no tabs?

emacs:
- um.

opera:
- pros: passes acid2 test.
- cons: slower than safari, bloated, has ads in the browser, costs money, proprietary, shoves a lot of useless features in your face [blog and my opera? no thanks], copied apple with the widgets, no text editor.

Or do you know any text-editor which can handle regular expressions?

I do not know many that don't. Excluding 70's console freewares, only notepad and Gedit don't have regexes out of the box.
Even notepad drop-in replacements like notepad2 support them.
On real computers, Textmate, Textwrangler/BBEdit and SubEthaEdit support them too.