Python 正则表达式 : how to do a negative lookahead with a string which don't start immediately?

Question

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

(?!...)
Matches if ... doesn’t match next. This is a negative lookahead assertion. For example, Isaac (?!Asimov) will match 'Isaac ' only if it’s not followed by 'Asimov'.

但是如果Isaac和Asimov之间有一个或多个单词怎么办？

Answer 1

Isaac(?!.*Asimov)

对以 Asimov 结尾的任何字符序列使用负前瞻。如果您想在 . 中包含换行符，[\s\S] 或 DOTALL 标志可能比较合适。