On Thu, Aug 28, 2008 at 5:04 PM, Bart Kastermans <[EMAIL PROTECTED]> wrote: > I have a file in which I am searching for the letter "i" (actually > a bit more general than that, arbitrary regular expressions could > occur) as long as it does not occur inside an expression that matches > \\.+?\b (something started by a backslash and including the word that > follows). > > More concrete example, I have the string "\sin(i)" and I want to match > the argument, but not the i in \sin. > > Can this be achieved by combining the regular expressions? I do not > know the right terminology involved, therefore my searching on the > Internet has not led to any results.
Try searching again with the "lookahead" term, or "negative lookahead". > > I can achieve something like this by searching for all i and then > throwing away those i that are inside such expressions. I am now just > wondering if these two steps can be combined into one. > > Best, > Bart > -- > http://www.bartk.nl/ > -- > http://mail.python.org/mailman/listinfo/python-list > -- -- Guilherme H. Polo Goncalves -- http://mail.python.org/mailman/listinfo/python-list
