返回给定 URL 中音频文件的最后一个文件夹名称

Question

I want to return the the last folder in which the wav file is inside:

So if we have this URL:

const dec = "https://langfox.ir/expect/sources/frozen_2019/the_beautiful_forest_version_1/are you enjoying your new frozen layer/1614282551749614446037f2253780f2f.wav";

We should return exactly:

are you enjoying your new frozen layer

I can substring the url but I can't find out the index of / signs correctly...

 const dec = "https://langfox.ir/expect/sources/frozen_2019/the_beautiful_forest_version_1/are you enjoying your new frozen layer/1614282551749614446037f2253780f2f.wav" var mySubString = dec.substring( dec.lastIndexOf("/") - X, // X is something I can't find out dec.lastIndexOf("/") ); console.log(mySubString);

How can we do this?

Answer 1

Converting my comment to answer so that solution is easy to find for future visitors.

You can do it split + splice operation like this:

 const dec = "https://langfox.ir/expect/sources/frozen_2019/the_beautiful_forest_version_1/are you enjoying your new frozen layer/1614282551749614446037f2253780f2f.wav"; var p = dec.split('/').slice(-2)[0]; console.log(p); //=> are you enjoying your new frozen layer

Answer 2

Get the index of the backslash in a substring before the last backslash:

 const dec = "https://langfox.ir/expect/sources/frozen_2019/the_beautiful_forest_version_1/are you enjoying your new frozen layer/1614282551749614446037f2253780f2f.wav" var mySubString = dec.substring( dec.substring(0, dec.lastIndexOf("/")).lastIndexOf("/")+1, dec.lastIndexOf("/") ); console.log(mySubString);