How to verify that the input string is in the correct social credit code format using PHP regular expressions

In modern society, the credit system has become an important guarantee for social progress and development, and the social credit codes of various institutions have therefore become extremely important information. Among them, the correctness test of social credit codes is particularly critical. In this article, we will introduce how to use PHP regular expressions to verify whether the input string is in the correct social credit code format.

First of all, we need to understand the structure and rules of social credit codes. The social credit code consists of 18 digits or letters, of which the last digit is a check code, and the other 17 digits consist of the institution code, registration management department code, and organization code. It can be seen that the main purpose of social credit code verification is to verify whether the 17-digit code is correct.

Next, we need to use PHP regular expressions to verify whether the input string is correct. Regular expressions are a very important text matching tool used to match, find or replace specific characters or strings. In PHP, regular expression matching can be performed through the preg_match() function.

The code example is as follows:

function validate_credit_code($credit_code)
{
    $regex = '/^([0-9ABCDEFGHJKLMNPQRTUWXY]{2})(d{6})([A-Za-z0-9]{9})([0-9A-Za-z]{1})$/';
    if (preg_match($regex, $credit_code)) {
        return true; // 验证成功
    } else {
        return false; // 验证失败
    }
}

In the above code, we use a regular expression to verify the social credit code, where:

• ^ and $ represent the beginning and end of the input string
• [0-9ABCDEFGHJKLMNPQRTUWXY]{2} represents the institution code, which is 2 digits or uppercase letters The characters composed of letters
• (d{6}) represent the registration management department code, which is a 6-digit number
• ([A-Za-z0-9 ]{9}) represents the organization code, which is a 9-digit character consisting of numbers or uppercase and lowercase letters
• ([0-9A-Za-z]{1}) represents the check code, which is a 1-digit character consisting of numbers or uppercase and lowercase letters

The above rules must be strictly followed in order to pass the regular expression verification.

Finally, let's verify whether an actual social credit code complies with the rules:

$credit_code = '91110108MA00B6Q4X8';
if (validate_credit_code($credit_code)) {
    echo "验证成功";
} else {
    echo "验证失败";
}

The output result will be "Verification successful" because the social credit code complies with the rules.

To sum up, using PHP regular expressions to verify whether the input string is in the correct social credit code format is a simple and reliable method. Just use appropriate regular expressions to effectively eliminate incorrect inputs and improve the accuracy and reliability of data.

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