Javascript是否在两个相同字符之间加减号？

Question

I'm trying to extract a substring from another string that exists between two of the same characters.

This is my entire string:

abcdefg?hijk?lmnop

And this is the substring that I want to extract:

abcdefg? hijk ?lmnop

_

I tried using this code:

currenturl.substring(currenturl.lastIndexOf("?") + 1, currenturl.lastIndexOf("?"));

But it only returns "?"

Thanks for any advice!

Answer 1

You should use indexOf which returns the index of the first matching ? as the first param to subString :

 const currenturl = "abcdefg?hijk?lmnop"; const result = currenturl.substring(currenturl.indexOf("?") + 1, currenturl.lastIndexOf("?")); console.log(result);