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HomeBackend DevelopmentGolangHow to extract numbers from Golang string using regular expression?

使用正则表达式从 Golang 字符串中提取数字:正则表达式语法:[0-9]+ 匹配一个或多个十进制数字。使用 regexp 包:导入 regexp 包并编译正则表达式。使用 FindAllString 查找所有匹配项。循环输出提取的数字。

如何用正则表达式从 Golang 字符串中提取数字?

如何用正则表达式从 Golang 字符串中提取数字

在 Golang 中,正则表达式是用于模式匹配和文本处理的强大工具。本教程将指导你如何使用正则表达式从字符串中提取数字。

1. 正则表达式语法

以下是匹配数字的正则表达式语法:

[0-9]+

它表示匹配一个或多个十进制数字。

2. 使用 regexp 包

Go 提供了 regexp 包用于处理正则表达式。以下是提取数字的步骤:

import (
    "fmt"
    "regexp"
)

func main() {
    text := "The year is 2023, and the value is $100."
    
    // 编译正则表达式
    r, err := regexp.Compile("[0-9]+")
    if err != nil {
        // 在这里处理错误
    }
    
    // 查找所有匹配项
    matches := r.FindAllString(text, -1)
    
    // 循环输出提取的数字
    for _, match := range matches {
        fmt.Println(match) // 将打印 "2023" 和 "100"
    }
}

3. 用例:提取价格

假设我们有一个包含产品名称和价格的字符串:

"iPhone 13: $899, Samsung Galaxy S22: $799"

我们可以用正则表达式提取价格:

func extractPrice(text string) ([]string, error) {
    r, err := regexp.Compile("[0-9]+")
    if err != nil {
        return nil, err
    }

    matches := r.FindAllString(text, -1)
    return matches, nil
}

func main() {
    text := "iPhone 13: $899, Samsung Galaxy S22: $799"
    prices, err := extractPrice(text)
    if err != nil {
        // 在这里处理错误
    }
    
    for _, price := range prices {
        fmt.Println(price) // 将打印 "899" 和 "799"
    }
}

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