English Dictionary

negative lookahead

noun

(regular expressions) The analysis of the subsequent characters absence before the regular expression is matched (symbol: ?!).

The negative lookahead in the regular expression ensures that the pattern is not followed by a specific sequence of characters.

意味（1）

(regular expressions) The analysis of the subsequent characters absence before the regular expression is matched (symbol: ?!).

Negative lookahead works just like positive lookahead, except that whereas positive lookahead matches when the regex inside the lookahead matches, negative lookahead matches when the regex inside the lookahead failed to match.