03. Extension Notations and Assertions 03. Extension Notations and Assertions Extension Notations and Non-Capturing Groups Named Groups and groupdict() Assertions Positive Lookahead Assertions Negative Lookahead Assertions Positive Lookbehind Assertions Negative Lookbehind Assertions Extension Notations and Non-Capturing Groups [ ↥ Back To Top ] Named Groups and groupdict() [ ↥ Back To Top ] Assertions Positive Lookahead Assertions [ ↥ Back To Top ] Negative Lookahead Assertions [ ↥ Back To Top ] Positive Lookbehind Assertions [ ↥ Back To Top ] Negative Lookbehind Assertions [ ↥ Back To Top ]