JS 刪除最后一次出現字符后的所有內容

Question

好的，我有這個

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";
console.log(URL.substring(URL.lastIndexOf("/")));

給你“/remove-everything-before-the-last-occurrence-of-a-character”

我如何獲得“ http://stackoverflow.com/questions/10767815/ ”

Answer 1

這個給你：

 var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character"; alert(URL.substring(0, URL.lastIndexOf("/") + 1));

希望這可以幫助。

Answer 2

似乎是正則表達式的一個很好的例子（不敢相信還沒有人發布它）：

URL.replace(/[^\/]+$/,'')

刪除字符串末尾的所有連續非正斜杠字符（即最后一個 / 之后的所有內容）。

Answer 3

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";

console.log(URL.substring(0,URL.lastIndexOf('/')+1));
//The +1 is to add the last slash

Answer 4

通用解決方案

這是一個通用函數，當在我們正在搜索的字符串（haystack）中找不到搜索到的字符或字符串（針）時，它也可以處理邊緣情況。 在這種情況下，它返回原始字符串。

 function trimStringAfter(haystack, needle) { const lastIndex = haystack.lastIndexOf(needle) return haystack.substring(0, lastIndex === -1 ? haystack.length : lastIndex + 1) } console.log(trimStringAfter('abcd/abcd/efg/ggfbf', '/')) // abcd/abcd/efg/ console.log(trimStringAfter('abcd/abcd/abcd', '/')) // abcd/abcd/ console.log(trimStringAfter('abcd/abcd/', '/')) // abcd/abcd/ console.log(trimStringAfter('abcd/abcd', '/')) // abcd/ console.log(trimStringAfter('abcd', '/')) // abcd

Answer 5

console.log(URL.substring(0, URL.lastIndexOf("/")+1));

Answer 6

試試這個 jsfiddle或運行代碼片段。

 var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character"; var myRegexp = /^(.*\\/)/g; var match = myRegexp.exec(URL); alert(match[1]);

Answer 7

運行這個：

 var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character"; var temp = URL.split('/'); temp.pop(); var result = temp.join('/'); alert(result);

Answer 8

嘗試使用.match()和RegExp /^\\w+.*\\d+\\//

 var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character"; var res = URL.match(/^\\w+.*\\d+\\//)[0]; document.body.textContent = res;

Answer 9

嘗試基於數組的提取，如

 var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character"; snippet.log(URL.split('/').slice(0, 5).join('/'));

 <!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 --> <!-- To show result in the dom instead of console, only to be used in the snippet not in production --> <script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>