Go language regular expression skills: How to match the operator of a mobile phone number

Go language regular expression skills: How to match the operator of a mobile phone number

Introduction:
Regular expression is a powerful string matching tool that can be used to find matches in text that match a certain A pattern string. In the Go language, the regexp package in the standard library provides support for regular expressions. This article will introduce how to use regular expressions to match the operator of a mobile phone number, helping readers better use regular expressions to process mobile phone numbers.

1. Initialize the regular expression
   First, we need to initialize the regular expression and compile it into an object. In the Go language, we can use the regexp.MustCompile function to compile and return a *regexp.Regexp instance. The following is a sample code:

import "regexp"

func main() {
    // 手机号码运营商正则表达式
    regex := regexp.MustCompile(`^1(3[4-9]|4[7]|5[0-27-9]|7[678]|8[2-478])d{8}$`)
    
    // 进行手机号码运营商匹配
    phoneNumber := "13456789012"
    if regex.MatchString(phoneNumber) {
        println("匹配成功")
    } else {
        println("匹配失败")
    }
}

In the above code, the regular expression ^1(3[4-9]|4[7]|5[0-27-9 ]|7[678]|8[2-478])d{8}$ is used to match mainland China mobile phone numbers. This regular expression can match mobile phone numbers starting with 1, followed by 3, 4, 5, 7 or 8, and then 8 digits. If the match is successful, "Match Success" is output, otherwise "Match Failed" is output.

2. Use subexpressions to extract matching results
   In the above example code, we only judged whether the mobile phone number matched, but did not extract the operator information. Below, we'll use subexpressions to extract matching results.

import (
    "fmt"
    "regexp"
)

func main() {
    // 手机号码运营商正则表达式
    regex := regexp.MustCompile(`^1((3[4-9])|(4[7])|(5[0-27-9])|(7[678])|(8[2-478]))d{8}$`)
    
    // 进行手机号码运营商匹配
    phoneNumber := "13456789012"
    if regex.MatchString(phoneNumber) {
        // 提取运营商信息
        result := regex.FindStringSubmatch(phoneNumber)
        if len(result) > 1 {
            fmt.Printf("运营商：%s
", getCarrier(result[1]))
        }
    } else {
        println("匹配失败")
    }
}

// 根据运营商编码获取运营商名称
func getCarrier(code string) string {
    switch code {
    case "34", "35", "36", "37", "38", "39":
        return "中国移动"
    case "47":
        return "中国移动（物联网号码）"
    case "50", "51", "52", "57", "58":
        return "中国联通"
    case "70", "71", "72":
        return "中国联通（物联网号码）"
    case "82", "83", "84", "85", "86", "87", "88", "89", "80":
        return "中国电信"
    case "74":
        return "中国电信（物联网号码）"
    }
    return "未知运营商"
}

In the above code, we use the subexpression (3[4-9])|(4[7])|(5[0-27-9]) |(7[678])|(8[2-478]) to match the carrier code, and use the regex.FindStringSubmatch function to extract the carrier code as a parameter to call getCarrierFunction, get the operator name and print it.

3. Conclusion
   This article introduces how to use regular expressions in Go language to match the operator of a mobile phone number. Through regular expressions, we can quickly verify the validity of the mobile phone number and extract operator information. In practical applications, we can combine regular expressions to perform operations such as filtering and classifying mobile phone numbers to improve development efficiency.

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