I am trying to match the folder name in a relative path using C#. I am using the expression: "/(.*)?/" and reversing the matching from left to right to right to left. When I pass "images/gringo/" into the regular expression, it correctly gives me "gringo" in the first group - I'm only interested in what is between the brackets. When I pass in "images/", it fails to pick up "images". I have tried using [/^] and [/$] but neither work.
我试图使用C#匹配相对路径中的文件夹名称。我使用表达式:“/(.*)?/”并从左到右,从右到左反转匹配。当我将“images / gringo /”传递给正则表达式时,它在第一组中正确地给了我“gringo” - 我只对括号之间的内容感兴趣。当我传入“images /”时,它无法获取“图像”。我尝试使用[/ ^]和[/ $],但都没有工作。
Thanks, David
4 个解决方案
#1
13
You're probably better off using the System.IO.DirectoryInfo class to interpret your relative path. You can then pick off folder or file names using its members:
您可能最好使用System.IO.DirectoryInfo类来解释您的相对路径。然后,您可以使用其成员选择文件夹或文件名:
DirectoryInfo di = new DirectoryInfo("images/gringo/");
Console.Out.WriteLine(di.Name);
This will be much safer than any regexps you could use.
这比你可以使用的任何regexp都安全得多。
#2
3
Don't do this. Use System.IO.Path to break apart path parts and then compare them.
不要这样做。使用System.IO.Path拆分路径部分,然后比较它们。
#3
2
How about:
"([^/]+)/?$"
- 1 or more non / characters
- Optional /
- End of string
1个或多个非/字符
字符串结束
But as @Blair Conrad says - better to go with a class that encapsulates this for you....
但正如@Blair Conrad所说的那样 - 最好还是选择一个为你封装这个的类......
#4
1
Agreed with the "don't do it this way" answers, but, since it's tagged "regex"...
同意“不要这样做”的答案,但是,因为它被标记为“正则表达式”......
- You don't need the ?. * already accepts 0 repetitions as a match, so (.*) is exactly equivalent to (.*)?
- You rarely actually want to use .* anyhow. If you're trying to capture what's between a pair of slashes, use /([^/]*)/ or else testing against "foo/bar/baz/" will (on most regex implementations) return a single match for "bar/baz" instead of matching "bar" and "baz" separately.
你不需要? *已经接受0次重复作为匹配,所以(。*)完全等同于(。*)?
你总是很少想要使用。*无论如何。如果你试图捕捉一对斜杠之间的内容,使用/([^ /] *)/或者对“foo / bar / baz /”进行测试(在大多数正则表达式实现中)将为“bar”返回单个匹配/ baz“而不是分别匹配”bar“和”baz“。
#1
13
You're probably better off using the System.IO.DirectoryInfo class to interpret your relative path. You can then pick off folder or file names using its members:
您可能最好使用System.IO.DirectoryInfo类来解释您的相对路径。然后,您可以使用其成员选择文件夹或文件名:
DirectoryInfo di = new DirectoryInfo("images/gringo/");
Console.Out.WriteLine(di.Name);
This will be much safer than any regexps you could use.
这比你可以使用的任何regexp都安全得多。
#2
3
Don't do this. Use System.IO.Path to break apart path parts and then compare them.
不要这样做。使用System.IO.Path拆分路径部分,然后比较它们。
#3
2
How about:
"([^/]+)/?$"
- 1 or more non / characters
- Optional /
- End of string
1个或多个非/字符
字符串结束
But as @Blair Conrad says - better to go with a class that encapsulates this for you....
但正如@Blair Conrad所说的那样 - 最好还是选择一个为你封装这个的类......
#4
1
Agreed with the "don't do it this way" answers, but, since it's tagged "regex"...
同意“不要这样做”的答案,但是,因为它被标记为“正则表达式”......
- You don't need the ?. * already accepts 0 repetitions as a match, so (.*) is exactly equivalent to (.*)?
- You rarely actually want to use .* anyhow. If you're trying to capture what's between a pair of slashes, use /([^/]*)/ or else testing against "foo/bar/baz/" will (on most regex implementations) return a single match for "bar/baz" instead of matching "bar" and "baz" separately.
你不需要? *已经接受0次重复作为匹配,所以(。*)完全等同于(。*)?
你总是很少想要使用。*无论如何。如果你试图捕捉一对斜杠之间的内容,使用/([^ /] *)/或者对“foo / bar / baz /”进行测试(在大多数正则表达式实现中)将为“bar”返回单个匹配/ baz“而不是分别匹配”bar“和”baz“。