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How to find HTML tags using regular expressions in Go?

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Jun 03, 2024 pm 08:00 PM

htmlregular expression

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？

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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