如何在JavaScript中的两个自定义html标签之间获取文本？

Question

I am wondering how I can get text between two custom html tags. Example:

 const a = "Hello, <num>22</num>"; //And here i want to get only 22 (between these two tags <num></num> //I've tried something like this: const nr = a.match(/<num>(.*?)<\\/num>/g); console.log(nr); //But as you can see, it will only output <num>22</num> 

Answer 1

While you could just access the contents using something like innerHTML , to answer your question from an input string via regular expression, you could use the exec() function. This will return an array where the first element is the entire matched string <num>22</num> , and subsequent elements will correspond to the captured groups. So nr[1] will yield 22 .

 const a = "Hello, <num>22</num>"; const nr = /<num>(.*?)<\\/num>/g.exec(a); console.log(nr[1]); 

Note that exec() is a function of RegExp, not String like match() is.

Answer 2

It's generally not recommended to parse (x)html using regex .

Just a quick snippet here that works in Chrome, it looks like you can run queries against custom tags and also use the textContent property to get to the inner text:

 const customContent = document.querySelector('custom').textContent console.log(`custom tag's content: ${ customContent }`) const numContent = document.querySelector('num').textContent console.log(`num tag's content: ${ numContent }`) 

 <custom>inner text</custom> <num>some more inner text</num> 

Answer 3

In addition to the provided answers you could also add the string to a new element and search for it normally, for example

 const a = "Hello, <num>22</num>"; var wrapper = document.createElement("div"); wrapper.innerHTML = a; var element = wrapper.getElementsByTagName("num")[0]; console.log(element.innerHTML); 

This allows you to match without actually inserting the text into the DOM and allows you to avoid regex which is not safe when parsing html.