Split with empty pattern returns extra empty strings #90
Description
Bug Description
re.Split("", "abc") returns extra empty strings at the start and end compared to stdlib.
Reproduction
// stdlib
re := regexp.MustCompile("")
re.Split("abc", -1) // returns ["a", "b", "c"]
// coregex
re := coregex.MustCompile("")
re.Split("abc", -1) // returns ["", "a", "b", "c", ""]Expected vs Actual
| Engine | Result |
|---|---|
| stdlib | ["a", "b", "c"] |
| coregex | ["", "a", "b", "c", ""] |
Root Cause
The Split implementation does not handle empty pattern matching correctly at boundaries.
Impact
Applications using Split("", str) to split into characters get unexpected empty strings.