Use regular expressions in golang to verify whether the input is a legal water bill payment account number

In Go language, it is a very simple process to use regular expressions to verify whether the input is a legal water bill payment account number. The water bill payment account number is composed of a number string of a certain length, usually 10 or 13 digits. Before proceeding with verification, we need to understand the basic rules of regular expressions.

Regular expression is a method used to describe text patterns. It consists of some special characters and ordinary characters. In the Go language, we can use the regexp package in the standard library to perform regular expression operations.

First, we need to define a regular expression that meets the requirements, and then use this expression for verification. Before verification, we need to convert the string to be verified, which can be done using the function in the strconv package.

Next, we can start writing the verification function. The following is a basic implementation demo:

package main

import (
    "fmt"
    "regexp"
    "strconv"
)

func checkWaterAccountNum(accountNum string) bool {
    //定义正则表达式
    reg := regexp.MustCompile(`^d{10}$|^d{13}$`)
    
    //转换待验证的字符串
    num, err := strconv.ParseInt(accountNum, 10, 64)
    if err != nil {
        fmt.Println(err)
        return false
    }
    
    //进行验证
    if !reg.MatchString(strconv.FormatInt(num, 10)) {
        return false
    }

    return true
}

func main() {
    //测试样例
    accountNum := "1234567890"
    if checkWaterAccountNum(accountNum) {
        fmt.Println("输入合法")
    } else {
        fmt.Println("输入不合法")
    }
}```

在上面的代码中，我们首先定义了一个正则表达式`^d{10}$|^d{13}$`，代表10位或13位的数字串；然后使用strconv包中的函数将待验证的字符串进行转换；最后使用正则表达式进行验证。如果验证通过，则返回true，否则返回false。

需要注意的是，在转换过程中，我们需要指定参数为10进制且能够被64位int类型表示。

在实际应用中，我们可以将验证函数封装成一个公共的函数，供其他程序调用。这样可以避免重复编写代码，提高程序的可重用性。

The above is the detailed content of Use regular expressions in golang to verify whether the input is a legal water bill payment account number. For more information, please follow other related articles on the PHP Chinese website!