如何使用正则表达式从字符串中提取整数？

Question

我从可能包含整数的不同来源获取任意字符串。以下是一些例子：

1. "He owns 3 cars"
2. "John has $23 and 50 cents"
3. "The range is 1-12 cm"

我想解析它们，以便输出如下：

1. "3"
2. "23-50"
3. "1-12"

Answer 1

"John has 23$ and 50 cents".scan(/\d+/).join("-") # => "23-50"
"The range is 1-12 cm".scan(/\d+/).join("-") # => "1-12"
"He owns 3 cars".scan(/\d+/).join("-") # => "3"