Golang removes html tags

With the popularity of the Internet, HTML markup language has become one of the commonly used languages in network programming. When making web pages, we will use HTML to create web pages, and achieve various visual effects and functions by inserting different tags and elements into HTML.

However, in some scenarios where HTML content needs to be processed, we need to remove the HTML tags and retain only the plain text content, such as search engines crawling web page information, processing crawler data, etc. This article will introduce how to remove HTML tags in golang.

1. Using regular expressions

The regexp package in golang can use regular expressions to match and process strings. We can use regular expressions to match HTML tags and replace the tags with empty strings. Here is a sample program:

package main

import ( "fmt" "regexp" )

func main() { text := " Hello, World!

" re := regexp.MustCompile(` ]*>`) result := re.ReplaceAllString(text, "")

fmt.Println(result) } Output:

Hello, World! This program uses the regular expression 549a3fd9a3c62568d8b32cd8627105c3]*> to match all HTML Tag, where e6b03d36a61d812034a605718041119d]* represents any character without the ">" symbol, > It is the ">" symbol, so that it can match the entire HTML tag.

2. Use third-party libraries

golang has many very useful third-party libraries that can help us quickly develop and deploy applications. In the task of removing HTML tags, we can use a third-party library named github.com/microcosm-cc/bluemonday .

The following is a sample program:

package main

import ( "fmt"

"github.com/microcosm-cc/bluemonday" )

func main() { text := " Hello, World!

" policy := bluemonday.StrictPolicy() result := policy.Sanitize(text)

fmt.Println(result) } Output:

Hello, World! This program uses the github.com/microcosm-cc/bluemonday library to remove HTML tags, this library provides a very rich API and default strategies, which can help us quickly remove HTML tags.

3. Use goquery library

golang also has a very easy-to-use third-party library github.com/PuerkitoBio/goquery . This library is used to parse HTML and XML Document, we can use this library to remove HTML tags. The following is a sample program:

package main

import ( "fmt" "strings"

"github.com/PuerkitoBio/goquery" )

func main() { text := " Hello, World!

" r := strings.NewReader(text) doc, _ := goquery.NewDocumentFromReader(r) result := doc.Text()

fmt.Println(result) } Output:

Hello, World! This program uses the github.com/PuerkitoBio/goquery library to parse the HTML document and extract the Plain text content, so that HTML tags can be removed.

4. Precautions

No matter what method is used to remove HTML tags, there are some precautions that we need to follow:

When using regular expressions to match HTML tags When doing this, you must ensure that the regular expression covers all tags, otherwise misjudgments or tags will be missed; Expected results; Some web pages may contain some special characters (such as ), CSS styles (such as style), etc. These contents also need to be handled with attention. 5. Summary There are many ways to remove HTML tags in golang. We can use regular expressions, third-party libraries, etc. After comparison and experiment, we recommend using the

github.com/microcosm-cc/bluemonday and github.com/PuerkitoBio/goquery libraries to remove HTML tags. Both libraries are very good. It has good compatibility and stability. Of course, for some simpler scenarios, regular expressions can also be used. When using any method, we need to pay attention to some details and precautions to ensure the normal operation of the program.

Golang removes html tags

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