How 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
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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