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 allbackground-colorproperty 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 theioutil.ReadFilefunction to read the content of the CSS file. Then, create a regular expression object through theregexp.MustCompilefunction to match thebackground-colorattribute value. The regular expressionbackground-color:s*(#(?:[0-9a-fA-F]{3}){1,2});has the following meaning:

• background-color:: Match thebackground-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.FindAllStringSubmatchfunction to find all matching strings from the CSS file. Use-1as the second parameter to find all matching results.

Finally, we use

forto loop through the matching results and print out the matchedbackground-colorattribute value.

Using the above code example, we can extract all

background-colorattribute 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

FindAllStringSubmatchfunction 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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