How to verify postal code's suffix using regular expression in golang

With the development of the Internet, more and more services have transferred their business from offline to online. In order to ensure smooth communication and transactions, many websites need to collect users' address information. When collecting address information, postal code is an important data item. It not only helps users quickly confirm their address information, but also helps postmen deliver letters and packages quickly and accurately. Therefore, it is very important for any website that needs to collect address information to verify that the postal code is correct.

In Go language, to verify the suffix of postal code, you can use regular expressions. Next, we'll look at how to use regular expressions to validate the suffix of a postal code.

First, let’s look at a normal zip code. The postal code generally consists of 6 digits and is divided into two parts: the first three digits are the code for the recipient's area, and the last three digits are the code for the delivery office or delivery section. In some areas, a 9-digit postal code containing letters and numbers is also available. What we need to verify is the last three parts of the 9-digit postal code.

In order to achieve this goal, you first need to import the Go regular expression package regexp. We can then use the regexp.MustCompile function to create a regular expression object.

import "regexp"

func validateZipCode(zipCode string) bool {
    regex := regexp.MustCompile(`^d{5}(-d{4})?$`)
    return regex.MatchString(zipCode)
}

In this function, we use a regular expression to match the zip code. ^d{5}(-d{4})?$ means we want to match:

First is the beginning of a line (^), followed by 5 Number(d{5}). Then there is an optional '-', followed by 4 digits. This optional '-' and the next 4 digits form the optional suffix part.

We can call the regex.MatchString function to check whether the zip code conforms to the rules of the regular expression. If the zip code matches the rule, the match is successful, otherwise, the match fails.

The following is a simple main function showing how to use the validateZipCode function:

func main() {
    // 邮政编码
    zipCode1 := "94555-1234"
    zipCode2 := "94103"
    zipCode3 := "123456789"
    
    fmt.Println(validateZipCode(zipCode1)) // 输出true
    fmt.Println(validateZipCode(zipCode2)) // 输出true
    fmt.Println(validateZipCode(zipCode3)) // 输出false
}

In this example, we use the validateZipCode function to validate 3 different zip codes, the first of which and The second one conforms to the rules of the regular expression and outputs true. The third zip code does not comply with the rules and outputs false.

To summarize, it is very simple to use regular expressions to verify the suffix of postal code in Go language. Just import the regexp package, create a regular expression object and call the MatchString function. This method is very flexible and can handle postal codes in different formats. At the same time, you can also customize more detailed verification rules as needed.

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