How to verify bank card number using regular expression in golang

In daily life, bank card number is an important identity information that we often need to verify. Using regular expressions in golang can easily verify bank card numbers. Let us learn how to use regular expressions to verify bank card numbers.

Basic rules for bank card numbers:

First of all, we need to understand the basic rules for bank card numbers. At present, domestic bank card numbers are generally 16 to 19 digits, of which the first 6 digits are usually the bank identification code, the last 10 to 13 digits are the account identification code, and the last digit is the verification code. However, the bank card number rules adopted by different banks may be different, so when verifying the bank card number, adjustments need to be made according to the specific situation.

Regular expression verification:

In golang, we can use regular expressions to verify bank card numbers. The following is a regular expression that can match 16~19 digits:

^(\d{16}|\d{17}|\d{18}|\d{19})$

Then, we can use golang's built-in regexp package to perform regular expression matching.

package main

import (
    "fmt"
    "regexp"
)

func validateBankCardNumber(cardNumber string) bool {
    regex := regexp.MustCompile("^(\d{16}|\d{17}|\d{18}|\d{19})$")
    return regex.MatchString(cardNumber)
}

func main() {
    cardNumber := "622202******1234"
    fmt.Printf("卡号 %s 是否合法: %v
", cardNumber, validateBankCardNumber(cardNumber))

    cardNumber = "123456789012345"
    fmt.Printf("卡号 %s 是否合法: %v
", cardNumber, validateBankCardNumber(cardNumber))
}

In the above example, we defined a function validateBankCardNumber to verify the legitimacy of the bank card number. This function accepts a string type bank card number as a parameter, uses regular expressions for matching, and finally returns a boolean type result.

In the main function we can see that we have verified a legal bank card number and an illegal bank card number respectively, and output the verification results. In practical applications, we can use bank card number verification functions in user registration, payment, etc. to ensure system security and data integrity.

Summary:

Using regular expressions to verify bank card numbers is a simple and effective way. The regexp package in golang provides a convenient way to use regular expressions. At the same time, we also need to pay attention to the differences in the rules of each bank's card number when using it, so that we can make appropriate adjustments. Through effective bank card number verification, the security and data integrity of the system can be improved, and the rights and interests of users and the stable operation of the system can be protected.

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