javascript查找字符串的一部分

Question

我不太习惯 Javascript，所以我在处理字符串时遇到了问题...

如果我有类似/folder1/folder2/folder3/的东西，我该如何解析它以便我最终只得到当前文件夹，例如“文件夹 3”？

谢谢!

Answer 1

var folderName = str.match(/(folder\d+)\/$/)[1];

应该这样做。

正则表达式的解释:

(      -> Start of capture group. We want a capture group because we just want 
          the folder name without the trailing slash.           
folder -> Match the string "folder"
\d+    -> Match one or more digits
)      -> End of capture group. This lets us capture strings of the form 
          "folderN", where N is a number.              
\/     -> Escape forward slash. We have to escape this because / is used to 
          represent the start and end of a regex literal, in Javascript.              
$      -> Match the end of the string.

我们选择数组的第二个元素(在索引 1 处)的原因是因为第一个元素包含匹配的完整字符串。这不是我们想要的；我们只想要捕获组。我们只有一个我们捕获的组，所以这是第二个元素。