Python regex: how to do a negative lookahead with a string which don't start immediately?

Question

From https://docs.python.org/2/library/re.html#regular-expression-syntax :

(?!...)
Matches if ... doesn’t match next. This is a ne

Answer 1

Isaac(?!.*Asimov)

Use a negative lookahead for any sequence of characters ending in Asimov. [\s\S] or the DOTALL flag may be appropriate if you want to include newlines in the ..