Where does “negative lookahead” come from?
negative lookahead (English) comes from English negative, from Middle English negative, from Old French negatif, from Latin negativus, from Latin negō, from Latin nec, from Latin neque, from Proto-Indo-European nekʷe — not.
negative lookahead (English): The analysis of the subsequent characters absence before the regular expression is matched (symbol:?!)
Definitions
- The analysis of the subsequent characters absence before the regular expression is matched (symbol:?!)
Ancestry of “negative lookahead”, step by step
negative lookahead traces back through two separate lines of ancestry.
via English negative
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | negative | Not positive nor neutral; Of electrical charge of... |
| 2 | Middle English | negative | — |
| 3 | Old French | negatif | — |
| 4 | Latin | negativus | denied, negative, that which denies; inhibiting |
| 5 | Latin | negō | to deny |
| 6 | Latin | nec | nor; and not, not; neither |
| 7 | Latin | neque | not; and not, also not |
| 8 | Proto-Indo-European | nekʷe | and not, neither, nor |
| 9 | Proto-Indo-European | ne | not |
via English lookahead
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | lookahead | The analysis in advance of subsequent decisions... |
| 2 | English | ahead | In or to the front; in advance; onward; In the... |
| 3 | English | head | The part of the body of an animal or human which... |
| 4 | English | -y | Added to nouns and adjectives to form adjectives... |
| 5 | Middle English | -y | Designates an adjective, in many cases formed by... |
| 6 | Old English | -iġ | -y, -ic |
| 7 | Proto-West Germanic | -g | Forms adjectives from nouns and verbs with a... |
| 8 | Proto-Germanic | -gaz | -y |
| 9 | Proto-Indo-European | -ḱos | -y, -ic |