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How to delete tags in html

PHPz

Release： 2023-04-21 14:58:17

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In web development, HTML is the most basic markup language. HTML tags tell the browser how to display text, images, tables and other elements. When creating web pages, we often need to add or delete certain tags to achieve better results or better readability. This article will explain how to remove tags in HTML.

1. Why should we delete tags

When writing HTML code, we often add some required tags, but some unnecessary tags may also appear. These unnecessary tags may be added due to copy-paste, duplication of external content, etc. Not only do these tags increase the size of your HTML file, they also slow down your website and can easily lead to coding errors. Therefore, we need to remove these unnecessary tags to improve the efficiency and quality of the website.

2. Use the editor to delete HTML tags

Now, many editors support the function of deleting HTML tags. The following will use Sublime Text as an example to demonstrate how to remove HTML tags.

Open the Sublime Text editor and open the HTML file you want to edit in it.
Select the tags you want to delete. In this article, we take removing the underline tag () in HTML as an example.

Press the Ctrl Shift P shortcut key, enter "remove tag" and select the "Remove Tag" option, then press the Enter key to delete the selected tag.

Save the edited HTML file. We can see that the underline tag has been successfully removed.

3. Use regular expressions to delete HTML tags

Another way to delete HTML tags is to use regular expressions. Regular expressions are a string matching technique that can be used to handle complex patterns in text.

The following is an example of using regular expressions to remove HTML tags:

import re

#定义HTML字符串
html_str = "<html><head><title>这是一个HTML文件</title></head><body><h1>欢迎来到我的网站</h1><p>这是一个HTML网页</p></body></html>"

#删除所有标签
re_str = re.sub('<[^>]+>', '', html_str)

#输出结果
print(re_str)

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After running the above code, you will get an HTML string without any tags. This code uses the re.sub() function to remove all tokens from the input string. Where:

'<¹ >' represents a regular expression used to match HTML tags. This expression matches all strings starting with < and ending with > and replaces them with the empty string.
re.sub() function is used to replace strings. The first parameter of this function is the regular expression, the second parameter is the string to be replaced, and the third parameter is the original string.

4. Notes

Before deleting HTML tags, we need to ensure that the deleted tags will not affect the readability and maintainability of the HTML file.

Also, using regular expressions to remove HTML tags is much more dangerous than using an editor to remove them. If we write incorrect regular expressions, we risk removing the wrong tags or causing irreversible damage to the HTML file. Therefore, it is recommended to back up your HTML files before using regular expressions.

Summary

In web development, deleting HTML tags is a common operation. When deleting tags, we can use an editor or regular expressions to do so. Using appropriate methods can not only improve code quality, but also improve the speed of the website. Therefore, when writing HTML code, you need to always pay attention to the deletion and addition of tags in order to maximize the efficiency and quality of the website.

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