斜杠包围数字的正则表达式
就像标题所说，我在 JavaScript 中有一个（错误的）正则表达式，它应该检查斜杠包围的“2”字符（在本例中）。因此，如果 URL 为 http://localhost/page/2/ 则正则表达式将通过。
就我而言，我有类似 http://localhost/?page=2 的内容，正则表达式仍然通过。
我不知道为什么。谁能告诉我有什么问题吗？
/^(.*?)\b2\b(.*?$)/
（我要告诉你，我没有写这段代码，我不知道它是如何工作的，因为我对正则表达式真的很糟糕）
Like the title says, I have a (faulty) Regex in JavaScript, that should check for a "2" character (in this case) surrounded by slashes. So if the URL was http://localhost/page/2/ the Regex would pass.
In my case I have something like http://localhost/?page=2 and the Regex still passes.
I'm not sure why. Could anyone tell me what's wrong with it?
/^(.*?)\b2\b(.*?$)/
(I'm going to tell you, I didn't write this code and I have no idea how it works, cause I'm really bad with Regex)
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评论（2）
看起来太简单了，但这不应该起作用吗？
： http://jsfiddle.net/QHac8/1/
因为它是 javascript，所以你必须转义正斜杠，因为它们是正则表达式字符串的分隔符。
或者如果你想匹配任何数字：
Seems too simple but shouldn't this work?:
http://jsfiddle.net/QHac8/1/
As it's javascript you have to escape the forward slashes as they are the delimiters for a regex string.
or if you want to match any number:
您不检查斜线包围的数字。您看到的斜杠只是您的正则表达式分隔符。检查每边是否有单词边界
\b的 2。对于/2/如此，对于=2也是如此。如果您只想允许斜杠包围的 2，请尝试使用此
^表示匹配字符串$的开头匹配，直到字符串(.*?)的结尾，这些部分匹配
2之前和之后的所有内容，并且这些部分存储在捕获组中。如果您不需要这些部分，那么 Richard D 是对的，正则表达式
/\/2\//适合您。You don't check for a digit surrounded by slashes. The slashes you see are only your regex delimiters. You check for a 2 with a word boundary
\bon each side. This is true for/2/but also for=2If you want to allow only a 2 surrounded by slashes try this
^means match from the start of the string$match till the end of the string(.*?)those parts are matching everything before and after your2and those parts are stored in capturing groups.If you don't need those parts, then Richard D is right and the regex
/\/2\//is fine for you.