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How to remove HTML tags using regular expressions

PHPz

Release： 2023-04-24 15:15:24

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HTML is an essential technology in Web page design and the key to content display in Web pages. But sometimes we need to extract the plain text content, then we need to remove the HTML tags. This article will introduce how to use regular expressions to remove HTML tags.

HTML tags are enclosed by angle brackets. In HTML tags, there are many attributes used to define the characteristics of elements, such as class and id. When using regular expressions to remove HTML tags, you need to pay attention to not only removing the tags, but also removing the attributes in the tags.

The specific regular expression is as follows:

/<[^>]+>/g

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Among them, / represents the beginning and end of the regular expression; the greater than sign and the less than sign represent the beginning and end of the HTML tag; ¹ means not matching any characters of >; means that the matching characters can be repeated one or more times; /g means full-text search, not one search.

For example, to remove all tags in the following HTML code:

<!DOCTYPE html>
<html>
  <head>
    <title>HTML标签测试</title>
  </head>
  <body>
    <h1>我们来测试一下HTML标签去除吧！</h1>
    <p>这是一个段落。</p>
  </body>
</html>

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You can use the following code in JavaScript:

var html = 'HTML标签测试我们来测试一下HTML标签去除吧！
这是一个段落。';

var pureText = html.replace(/<[^>]+>/g, '');
console.log(pureText);

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The above code will output the plain text after removing the HTML tags Text content:

HTML标签测试我们来测试一下HTML标签去除吧！这是一个段落。

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In this way, we successfully removed the HTML tags. During actual use, you also need to pay attention to the following points:

Regular expressions only apply to the plain text content of HTML tags, and are not applicable to JavaScript code and CSS styles in tags.
Some HTML tags can use attribute values to specify content, such as the alt attribute of the tag. These contents cannot be removed by regular expressions.
If the content contained in HTML tags is character entities, such as < and >, these entities need to be replaced in regular expressions, otherwise the tags will not be removed correctly.

In addition, you can also use a specialized HTML parsing library to extract HTML tags, such as Cheerio. But no matter which method is used, we need to remain vigilant to ensure that the extracted text content is accurate and in line with expectations.

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