How to use regular expressions in Go language to determine whether a string is a legal ID number

How to use regular expressions in Go language to determine whether a string is a legal ID number

The ID number is the unique identifier of each Chinese citizen and is also an important factor used by all aspects of society to identify individuals. in accordance with. In data processing, it is often necessary to determine whether a string is a legal ID number. This article will introduce how to use regular expressions in Go language to determine whether a string is a legal ID number.

In the Go language, using regular expressions requires the introduction of the regexp package. The following is a code example that uses regular expressions to determine whether the ID card number is legal:

package main

import (
    "fmt"
    "regexp"
)

func isIDCardNumberValid(idCardNumber string) bool {
    // 使用正则表达式进行匹配判断
    pattern := `^[1-9]d{5}(18|19|20|21|22|23|24|25|26)d{2}(0[1-9]|10|11|12)(0[1-9]|1d|2d|30|31)d{3}[0-9Xx]$`
    reg := regexp.MustCompile(pattern)
    return reg.MatchString(idCardNumber)
}

func main() {
    idCardNumber := "110105198812121234"
    if isIDCardNumberValid(idCardNumber) {
        fmt.Println("合法身份证号码")
    } else {
        fmt.Println("非法身份证号码")
    }
}

In the above code, we define an isIDCardNumberValid function, which receives a string type parameter idCardNumber and returns A boolean value. Regular expressions are used inside the function to match and determine whether the string meets the format requirements of the ID number.

The pattern of a regular expression is a string that uses a series of specific characters and symbols to describe the matching pattern. The regular expression pattern pattern in the above code can be interpreted as:

• ^ represents the starting position of the matching string;
• [1-9 ]d{5} means matching area code, that is, the first 6 non-zero digits;
• (18|19|20|21|22|23|24|25|26) means matching year, limited range is 18 to 26;
• d{2} means matching month, two digits;
• (0[1 -9]|10|11|12) indicates matching date, limited to 01 to 12;
• (0[1-9]|1d|2d|30|31) means matching date of birth, the limited range is 01 to 31;
• d{3} means matching sequence code, that is, the second to last digit to the fourth to last digit;
• [0-9Xx] represents matching check code, which can be numbers 0 to 9 or letters X or x;
• $ represents matching string end position.

reg := regexp.MustCompile(pattern) Compiles the regular expression pattern into a matchable regular expression object.

Call the reg.MatchString(idCardNumber) method to match the given string with the regular expression. If the match is successful, it will return true, otherwise it will return false.

In the main function of the program, we pass in an ID number for testing and print out the corresponding results.

Through the above code, we can easily use regular expressions in Go language to determine whether a string is a legal ID number. The regular expression pattern can be modified according to actual needs to accommodate ID card number matching in different formats.

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