如何让这个 URL 验证正则表达式不那么贪婪？
因此，我有以下正则表达式：
https?://(www\.)?flickr\.com/photos/(.+)/?
要与以下 URL 匹配：
http://www.flickr.com/photos/username/
如何阻止最后的正斜杠 (/) 包含在用户名子模式 (.+)< 中/代码>?
我尝试过：
https?://(www\.)?flickr\.com/photos/(.+?)/?
但是它只匹配用户名的第一个字母。
So I have the following regular expression:
https?://(www\.)?flickr\.com/photos/(.+)/?
To match against the following URL:
http://www.flickr.com/photos/username/
How can I stop the final forward slash (/) from being included in the username sub-pattern (.+)?
I have tried:
https?://(www\.)?flickr\.com/photos/(.+?)/?
But then it only matches the first letter of the username.
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评论（5）
我将
?:添加到第一组，因此它不会捕获，然后使用[^/]代替最后一场比赛中的点。这可以确保捕获“photos/”和下一个“/”之间的所有内容。如果您需要捕获第一个
www只需使用以下命令：I added
?:to the first group so it's not capturing, then used[^/]instead of the dot in the last match. This assures you that everything between "photos/" and the very next "/" is captured.If you need to capture the first
wwwjust use this:您需要确保它与正斜杠不匹配：
您还可以使正则表达式变得懒惰（我猜您正在使用
(.+?)语法执行此操作），但是上面的会工作得很好You need to make sure it doesn't match the forward slash:
You could also make the regex lazy (which is what I guess you were doing with the
(.+?)syntax), but the above will work just fine将
(.+)更改为([^/]+)。这将匹配，直到遇到/，因此您可能还想在类中添加一些其他内容。Change
(.+)to([^/]+). This will match until it encounters a/, so you might want to throw some other stuff in the class too.通常有两种方法可以做到这一点：
附加问号，使匹配非贪婪。
.*将尽可能匹配，.*?将尽可能少匹配。排除接下来要匹配的字符。如果您想在
/处停止，请使用[^/]*。There are generally two ways to do this:
Append a question mark, to make the matching non-greedy.
.*will match as much as possible,.*?will match as little as possible.Exclude the character you want to match next. If you want to stop on
/, use[^/]*.如果您知道尾部会有斜杠，请取出最后的
?。If you know there will be a trailing slash, take out the final
?.