Meaning of positive lookahead | Babel Free

Definitions

The analysis of the subsequent characters presence before the regular expression is matched (symbol: ?=).

countable, uncountable

Examples

“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.”

CEFR level