2011/8/18 Jan Dudík <jan.dudik@gmail.com>

in my cosmetic_changes.py I have following lines:

I think, that r in the beginning means regular expression, but u means
simple text.

Not really. r means raw text that means you don't have to double your backslashes. For example, you write r'\.' for a literal dot (since '.' means any character), but without r you should have to write '\\.' u means unicode, you must use it when there are non-Ascii characters in the expression. I like to use it always, it is safer. See fixes.py for examples in which these are combine: ur'blahblah'.

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