找到重叠的Regexp匹配项

Question

我想找到给定字符串中的所有匹配项,包括重叠匹配项.我怎么能实现它？

# Example
"a-b-c-d".???(/\w-\w/)  # => ["a-b", "b-c", "c-d"] expected

# Solution without overlapped results
"a-b-c-d".scan(/\w-\w/) # => ["a-b", "c-d"], but "b-c" is missing

Answer 1

在积极的前瞻中使用捕获:

"a-b-c-d".scan(/(?=(\w-\w))/).flatten
 # => ["a-b", "b-c", "c-d"]

参见Ruby演示