试图理解.NET正则表达式
[英]Trying to understand .NET regular expressions
问题描述
I've been doing a lot of reading on .NET regular expressions and I have developed a regular expression, that I can't make any sense of. 
我一直在做很多关于.NET正则表达式的阅读，我已经开发了一个正则表达式，我无法理解。
(src|href)="\w+|(\w+/)+
The way I read this regular expression: 我读这个正则表达式的方式：
- Match exactly "src" or "href" 完全匹配“src”或“href”
- Followed by =" 其次是=“
- Followed by match 1 or more word characters ([a-zA-Z0-9_]) or one or more of (one or more word characters followed by /) 接下来匹配1个或多个单词字符（[a-zA-Z0-9_]）或一个或多个（一个或多个单词字符后跟/）
This is meant to match something like 'src="Folder', 'src="folder/', 'href="Folder/SubFolder/', etc. 这是为了匹配'src =“Folder'，'src =”folder /'，'href =“Folder / SubFolder /'等。
Input: 输入：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
Using this regular expression, with this input, there is one match. 使用此正则表达式，使用此输入，有一个匹配项。
org/1999/
Can anyone possibly explain this? 任何人都可以解释一下吗？ Src or href aren't referenced in the entire string, how can there be any match at all? 整个字符串中没有引用Src或href，怎么会有任何匹配？
3 个解决方案
解决方案1
6 已采纳 2011-09-15 15:41:34
What's happening here is the | 这里发生的是| is seperating the regex into two completely seperate conditions. 正在将正则表达式分成两个完全独立的条件。 That is select either: (src|href)="\\w+ OR (\\w+/)+ of which second bit is being matched: 那就是选择： (src|href)="\\w+ OR (\\w+/)+ ，其中匹配第二位：
org/1999/
In your case you'd probably need to put the last part in parentheses to make it clear what exactly the alternation | 在你的情况，你很可能需要把最后一部分括号要清楚究竟交替| refers to: 指：
(src|href)="(\w+|(\w+/)+)
Btw I used Expresso to help work this out. 顺便说一句，我用Expresso来帮助解决这个问题。
解决方案2
3 2011-09-15 15:37:46
解决方案3
2 2011-09-15 15:39:19
Try this app http://www.regexbuddy.com/ . 试试这个应用程序http://www.regexbuddy.com/ 。 You can set the RegEx flavor to .NET and it has a great tab which breaks down each element of your RegEx. 您可以将RegEx风格设置为.NET，它有一个很好的选项卡，可以分解您的RegEx的每个元素。
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