Ruby的正則表達式匹配的字符串與數字

Question

的範圍之前我有2個字符串：

I have 4 cars in my house 
I have 14 cars in my house 

我們如何使用紅寶石（1.9.3）的正則表達式來檢查只有1到10輛匹配？

例：

I have 1 car in my house # => match 
I have 4 cars in my house # => match 
I have 10 cars in my house # => match 
I have 14 cars in my house # => should not match 
I have 100 cars in my house # => should not match 

此外，我們該如何匹配（即2輛）針對任何字符串？所以如果目標字符串包含'22輛汽車'，那麼它不應該匹配。

例：

some other string before 2 cars some other string after # => match 
some other string before 22 cars some other string after # => should not match  

Answer 1

正則表達式：/I have (?:1 car|[2-9] cars|10 cars) in my house/

您可以在http://rubular.com/

的嘗試interatively（？：XXX），使括號非獲取的陳述here。

Answer 2

使用該正則表達式：/I have ([1-9]|10) cars? in my house./

的[1-9]創建一個範圍的1,2,3,4,5,6,7,8,9和管道字符充當or以允許10.括號是一個捕獲組。汽車尾部的's'後面的問號意味着「零個或一個前面的字符」，因此匹配'汽車'和'汽車'。希望這有助於！