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With the popularity and increase in the number of cars, chassis numbers have become an indispensable part of our lives. The frame number is the "ID card" of the vehicle. It is a unique coded identification that can describe the vehicle's manufacturer, year of manufacture, vehicle model and other information. Therefore, it is very important for automobile manufacturers and users to correctly identify and verify the accuracy of the frame number. In this article, we will introduce how to use PHP regular expressions to verify that the input string is in the correct vehicle frame number format.
First of all, let us understand the basic format of the frame number. The frame number usually consists of 17 characters, which can be a combination of numbers and letters. The following is the format of the frame number:
According to the format of the frame number, we can use PHP regular expressions for verification. The following is a sample code:
function validateVin($vin) { $pattern = '/^[A-HJ-NPR-Z0-9]{17}$/'; return preg_match($pattern, strtoupper($vin)); } // 示例使用 $vin = '1GKFK63119R178558'; if (validateVin($vin)) { echo '车架号为正确格式'; } else { echo '车架号为错误格式'; }
In the above code, we use PHP's preg_match function to match regular expressions. This function will return a number indicating whether the string matches the regular expression successfully. If the match is successful, 1 is returned, otherwise 0 is returned.
Some key points of regular expressions:
Finally, we need to note that the check digit of the frame number is calculated according to the ISO 3779 standard and is not set arbitrarily. Therefore, when actually verifying the frame number, we need to perform calculations according to the ISO 3779 standard to ensure the accuracy of the verification.
In short, it is very simple to use PHP regular expressions to verify whether the input string is in the correct frame number format. Just use regular expressions for matching and perform verification according to the ISO 3779 standard. The correct frame number format can help us better understand the vehicle's information, and can also prevent traffic accidents and other problems caused by incorrect frame numbers.
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