红宝石正则表达式不止一次发现模式

Question

value = "Men - $30, Women - $20"
# value = "Men - 0"
# value = "free"
data = /\$(\d*)/.match value

目前：

data.to_a
 => ["$30", "30"] 

我想要：

data.to_a
 => ["$30", "30", "$20", "20] 

如何做到这一点

Answer 1

使用String#scan

value = "Men - $30, Women - $20"

value.scan(/(\$(\d+))/)
# => [["$30", "30"], ["$20", "20"]]

value.scan(/(\$(\d+))/).flatten
# => ["$30", "30", "$20", "20"]