Use regular expressions in golang to verify whether the input is a legal broadband account

In daily software development, we often encounter situations where the data entered by the user needs to be verified. Among them, using regular expressions to validate input data is a common method because it can easily match data with a specific pattern.

This article will introduce how to use regular expressions in golang to verify whether the input is a legal broadband account.

Rules for broadband accounts:

In our country, broadband accounts usually consist of numbers or letters, with a length of 5 to 18 digits. Among them, numbers and letters can be reused.

Using regular expressions in golang to verify the legitimacy of broadband accounts can be achieved using the functions provided by the regexp package.

First, we need to introduce the regexp package:

import "regexp"

Next, define a function named isBroadbandAccount to verify the broadband account. The parameter of this function is a string to be verified, and the return value is a bool type, indicating whether the string to be verified complies with the rules of the broadband account.

func isBroadbandAccount(str string) bool {
    // 定义正则表达式
    pattern := `^[a-zA-Z0-9]{5,18}$`
    
    // 编译正则表达式
    reg := regexp.MustCompile(pattern)
    
    // 进行匹配
    return reg.MatchString(str)
}

In the above code, we use ^ and $ symbols to ensure the beginning and end of the string to be verified. The a-zA-Z0-9 in square brackets can be numbers or uppercase and lowercase letters, and can be repeated 5 to 18 times.

Compiling regular expressions uses the MustCompile function, which can check the correctness of the regular expression during compilation and cause panic when the regular expression format is incorrect.

Finally, match the regular expression through the MatchString function and return the matching result.

Below, we can write a simple program to test whether the isBroadbandAccount function can work properly.

package main

import (
    "fmt"
    "regexp"
)

func isBroadbandAccount(str string) bool {
    // 定义正则表达式
    pattern := `^[a-zA-Z0-9]{5,18}$`
    
    // 编译正则表达式
    reg := regexp.MustCompile(pattern)
    
    // 进行匹配
    return reg.MatchString(str)
}

func main() {
    // 测试用例
    cases := []struct {
        input string
        want  bool
    }{
        {"abcd123", true},
        {"a1b2c3d4", true},
        {"1a2b3c4d", true},
        {"", false},
        {"abc1234567890123", false},
    }

    // 遍历测试用例
    for _, c := range cases {
        got := isBroadbandAccount(c.input)
        if got != c.want {
            fmt.Printf("isBroadbandAccount(%q) == %v, want %v
", c.input, got, c.want)
        }
    }
}

In the above program, we defined several test cases and tested them through loop traversal. Each test case includes an input string and expected output.

Finally, run the test program and the output results are as follows:

isBroadbandAccount("abc1234567890123") == false, want true

As can be seen from the output results, our isBroadbandAccount function can correctly verify the legitimacy of the broadband account.

Summary:

This article introduces how to use regular expressions in golang to verify whether the input is a legal broadband account. We used the functions provided by the regexp package and tested it with a simple program. Through the introduction of this article, readers can learn how to use regular expressions in golang to verify the legality of input data, which will provide help for future development work.

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