Ruby正则表达式匹配字符串前面带有数字范围

Question

我有2个字符串：

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

我们如何使用ruby（1.9.3）正则表达式来检查只有1到10辆汽车匹配？

例如：

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

另外，我们如何匹配（即2辆车）任何字符串？因此，如果目标字符串包含＆＃39; 22辆汽车＆＃39;然后它不应该匹配。

例如：

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

使用此RegExp：/I have ([1-9]|10) cars? in my house./

[1-9]创建1,2,3,4,5,6,7,8,9的范围，管道字符作为or使用，以允许10个。括号为捕获组。汽车末端's'后面的问号意味着“零或一个前置字符”，因此匹配“汽车”和“汽车”。希望这有帮助！

Answer 2

正则表达式：/I have (?:1 car|[2-9] cars|10 cars) in my house/

您可以在http://rubular.com/

进行交互式尝试

（？：xxx）使括号不捕获如here所述。