How to find HTML tags using regular expressions in Go?
在 Go 中使用正则表达式查找 HTML 标记：安装 regexp 包。使用 regexp.MatchString 函数，传入正则表达式字符串和要搜索的字符串。如果匹配成功，该函数将返回 true，否则返回 false。例如，以下正则表达式将匹配
标记：regexp.MustCompile(e388a4556c0f65e1904146cc1a846bee.*94b3e26ee717c64999d7867364b1b4a3)。
如何在 Go 中使用正则表达式查找 HTML 标记
正则表达式 (regex) 是用于在文本中查找匹配模式的强大工具。在 Go 中，您可以使用 regexp 包来处理正则表达式。本文将演示如何在 Go 中使用正则表达式查找 HTML 标记。
安装 regexp 包
首先，您需要安装 regexp 包：
go get github.com/google/re2/regexp
使用正则表达式查找 HTML 标记
要使用正则表达式查找 HTML 标记，您可以使用 regexp.MatchString 函数。该函数接受一个正则表达式字符串和一个要搜索的字符串，并返回一个布尔值，如果匹配成功则为 true，否则为 false。
例如，以下正则表达式将匹配 <p></p> 标记：
regexp.MustCompile(`<p>.*</p>`)
要使用这个正则表达式查找 HTML 中的 <p></p> 标记，您可以这样做：
package main
import (
"fmt"
"regexp"
)
func main() {
html := `Hello, World!
`
re := regexp.MustCompile(`<p>.*</p>`)
if re.MatchString(html) {
fmt.Println("Found a <p> tag")
}
}执行此程序将输出：
Found a <p> tag
实战案例
假设您有一个包含 HTML 文档的字符串。您希望提取文档中的所有 <a></a> 标记并打印它们的 href 属性。以下是如何使用 Go 中的正则表达式执行此操作：
package main
import (
"fmt"
"regexp"
"strings"
)
func main() {
html := `<html><body><a href="link1.html">Link 1</a><a href="link2.html">Link 2</a></body></html>`
re := regexp.MustCompile(`<a href="(.*?)">`)
matches := re.FindAllStringSubmatch(html, -1)
for _, match := range matches {
fmt.Println(match[1])
}
}执行此程序将输出链接的 href 属性：
link1.html link2.html
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