How to extract CSS style attribute values ​​using regular expressions in Go language

How to use regular expressions to extract CSS style attribute values ​​​​in Go language

In web development, CSS style is a technology commonly used to beautify pages. Sometimes we need to extract a certain attribute value from a CSS style. In this case, we can use regular expressions to achieve this. This article will introduce how to use regular expressions to extract CSS style attribute values ​​​​in the Go language, with code examples.

First of all, we need to clarify the extraction target. Suppose we have the following CSS style fragment:

body {
    background-color: #ffffff;
    font-family: Arial, sans-serif;
    font-size: 14px;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

.title {
    color: #333333;
    font-size: 20px;
    font-weight: bold;
}

Our goal is to extract all background-color property values. The following is a code example in Go language:

package main

import (
    "fmt"
    "io/ioutil"
    "regexp"
)

func main() {
    // 读取CSS文件
    cssFile, err := ioutil.ReadFile("style.css")
    if err != nil {
        fmt.Println("读取CSS文件失败:", err)
        return
    }

    // 正则表达式匹配
    re := regexp.MustCompile(`background-color:s*(#(?:[0-9a-fA-F]{3}){1,2});`)
    matches := re.FindAllStringSubmatch(string(cssFile), -1)
    if matches == nil {
        fmt.Println("未找到匹配的属性值")
        return
    }

    // 输出匹配结果
    for _, match := range matches {
        fmt.Println("background-color:", match[1])
    }
}

In the above code, first we use the ioutil.ReadFile function to read the content of the CSS file. Then, create a regular expression object through the regexp.MustCompile function to match the background-color attribute value. The regular expression background-color:s*(#(?:[0-9a-fA-F]{3}){1,2}); has the following meaning:

• background-color:: Match the background-color: string in the string.
• s*: Matches 0 or more whitespace characters.
• (#(?:[0-9a-fA-F]{3}){1,2});: Matches starting with # and # Color value string ending with ##;. The color value can be a 3-digit or 6-digit hexadecimal number.

Next, we use the

re.FindAllStringSubmatch function to find all matching strings from the CSS file. Use -1 as the second parameter to find all matching results.

Finally, we use

for to loop through the matching results and print out the matched background-color attribute value.

Using the above code example, we can extract all

background-color attribute values ​​in the CSS file.

Summary:

This article introduces how to use regular expressions to extract CSS style attribute values ​​​​in the Go language. By creating a regular expression object, use the

FindAllStringSubmatch function to match the string, and obtain the attribute value by looping through the matching results. The specific matching rules of regular expressions can be modified according to actual needs.

I hope this article will be helpful to you in extracting CSS style attribute values ​​​​in Go language!

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