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How to use regular expressions in golang to verify whether the URL address is a first-level domain name

Jun 24, 2023 am 11:19 AM
regular expression golang url verification

In golang, it is very simple to use regular expressions to verify first-level domain names. First, we need to understand what a first-level domain name is.

The first-level domain name refers to the highest-level domain name among Internet domain names, usually consisting of one word or abbreviation. For example, com in google.com is the first-level domain name. Therefore, the URL address we want to verify should be in a format similar to www.google.com or abc.baidu.com.

Next, we can use golang's regular expression library regexp for verification. The following is a sample code:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^[a-zA-Z0-9]+(.[a-zA-Z0-9]+)*.[a-zA-Z]{2,}$`)

    urls := []string{"www.google.com", "abc.baidu.com", "www.google.cn", "abc.baidu.cn", "www.123.com", "www.google", "www.google."}

    for _, url := range urls {
        if re.MatchString(url) {
            fmt.Println(url, "是一级域名")
        } else {
            fmt.Println(url, "不是一级域名")
        }
    }
}
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In the above code, we first define a regular expression re, which can match URL addresses that conform to the first-level domain name format. Then, we defined a string slice urls for testing, which contains some URL addresses that conform to the first-level domain name format and some URL addresses that do not conform to the format. Finally, we use a for loop to traverse each URL address in the slice and use the re.MatchString function to verify whether it is a first-level domain name.

The output result of this code is:

www.google.com 是一级域名
abc.baidu.com 是一级域名
www.google.cn 是一级域名
abc.baidu.cn 是一级域名
www.123.com 是一级域名
www.google 不是一级域名
www.google. 不是一级域名
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It can be seen from the output result that the URL addresses that conform to the first-level domain name format are successfully verified, but do not conform to the first-level domain name format. URL addresses are excluded.

In summary, it is very simple to use the regular expression library regexp in golang to verify whether the URL address is a first-level domain name. Just define a suitable regular expression and then use the re.MatchString function to verify it. Hope this article can be helpful to everyone!

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