Go language regular expression practice: how to match ID card numbers

Go language regular expression practice: How to match ID card numbers

Introduction:
In daily development, we often need to verify and match ID card numbers. Regular expressions provide a powerful tool to handle this need. This article will introduce how to use regular expressions in Go language to match ID card numbers.

1. Format of ID card number
ID card number is a string of 18 characters, including 17 digits and a check code (the last digit may be a number or the letter X) . The format of the ID number is as follows:

1. The first 6 digits represent the place of origin (province, city, county)
2. The middle 8 digits represent the date of birth (year, month, day)
3. The last 4 digits represent the sequence code (used to distinguish people born on the same day)
4. The last digit is the check code (used to verify the first 17 digits)

二, Go language regular expression matching ID number
Go language provides a built-in regular expression library regexp, which we can use to handle regular expression matching operations.

The following is a sample code that uses regular expressions to match ID numbers:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    // 身份证号码的正则表达式
    idCardPattern := `^d{17}[d|X|x]$`
    idCardRegexp := regexp.MustCompile(idCardPattern)

    // 待匹配的身份证号码
    idCards := []string{
        "11010519880307541X",
        "310104198812173687",
        "53012419900107417X",
        "44010519951231061X",
        "3101041988121736878", // 非法身份证号码
    }

    // 遍历身份证号码并进行匹配
    for _, idCard := range idCards {
        if idCardRegexp.MatchString(idCard) {
            fmt.Printf("身份证号码 %s 是合法的
", idCard)
        } else {
            fmt.Printf("身份证号码 %s 是非法的
", idCard)
        }
    }
}

Run the above code, the output results are as follows:

身份证号码 11010519880307541X 是合法的
身份证号码 310104198812173687 是合法的
身份证号码 53012419900107417X 是合法的
身份证号码 44010519951231061X 是合法的
身份证号码 3101041988121736878 是非法的

In the above code, first define A regular expression string of an ID number idCardPattern, where ^d{17}[d|X|x]$ means it starts with 17 digits and the last digit is a digit or a string of letters X.

Then use the regexp.MustCompile() function to compile the regular expression string into a regular expression object idCardRegexp.

Next, a slice of ID number to be matched is defined idCards, which contains several legal and illegal ID numbers.

Finally use for to loop through idCards and match each ID number through the idCardRegexp.MatchString() method. If the match is successful, "ID card number xx is legal" is output, otherwise "ID card number xx is illegal" is output.

With this simple sample code, we can quickly verify whether an ID number is legal.

Conclusion:
This article introduces how to use regular expressions in Go language to match ID card numbers. By using regular expressions, we can easily verify and match ID numbers. I hope this article can help you better master the use of regular expressions in the Go language.

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