Where does “positive lookahead” come from?
positive lookahead (English) comes from English lookahead, from English ahead, from English head, from English -y, from Middle English -y, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz — -y, -ic.
positive lookahead (English): The analysis of the subsequent characters presence before the regular expression is matched (symbol:?=)
Definitions
- The analysis of the subsequent characters presence before the regular expression is matched (symbol:?=)
Ancestry of “positive lookahead”, step by step
positive lookahead traces back through two separate lines of ancestry.
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 |