How to verify license plate number using PHP regular expression

In modern society, vehicles have become an indispensable part of our daily lives. And each car has its own "ID card" - a license plate number. The license plate number is not only the identification of the vehicle, but also one of the important basis for traffic management. Because of this, the accuracy and standardization of license plate numbers are particularly important. This article will introduce how to use PHP regular expressions to verify the correctness of the license plate number.

1. What is PHP regular expression

PHP regular expression is a mechanism used to match strings. It consists of some characters and symbols, which can form a variety of matching rules. We can use the PHP function preg_match() or preg_replace() to match or replace strings. Using regular expressions can make string processing faster and more convenient.

2. Basic rules of license plate numbers

Before formally introducing the method of verifying license plate numbers with PHP regular expressions, it is necessary to understand the basic rules of license plate numbers. The license plate number consists of Chinese characters, letters, and numbers, and is generally divided into two parts. The first part is the abbreviation of the province, represented by a Chinese character; the second part is a mixture of letters and numbers, with a total of five or six digits.

  ------------------------
  |  京   |  A  |  12345  |
  ------------------------
    省份   字母   数字
  

There are some specific rules for the combination of province abbreviations and letters. For example, some provinces may use multiple letter abbreviations, and some industries may also need to use specific letter abbreviations.

3. How to verify the license plate number with PHP regular expression

Next we will use PHP regular expression to verify the license plate number.

1. Verify the first part - the province abbreviation

The first part of the license plate number consists of a Chinese character representing the province abbreviation. For example: Beijing, Tianjin, Shanghai, Chongqing, etc., all represent different provinces. The Chinese characters in the license plate number need to be verified through regular expressions.

Using PHP regular expressions, we can write the following regular expressions:

/^[x{4e00}-x{9fa5}]{1}/u

This regular expression starts matching from the beginning and only allows province abbreviations with one Chinese character to pass verification. Among them, "x{4e00}-x{9fa5}" represents the range of all Chinese characters in Unicode encoding.

2. Verify the second part - a mixture of letters and numbers

The second part of the license plate number is represented by a mixture of five or six letters and numbers . Verification tasks can be easily accomplished using PHP regular expressions.

For validation of a mixture of five or six letters and numbers, we write the following regular expression:

/^[A-Za-z0-9]{5,6}$ /

This regular expression matches from the beginning, only allows a mixture of uppercase and lowercase letters and numbers, and the mixture must be 5 or 6 digits. Among them, "{5,6}" represents the range of digits in a mixture of letters and numbers.

3. Connect the two parts of the regular expression

Finally, we connect the above two parts of the regular expression to verify the entire license plate number.

/^[A-Za-z0-9u4e00-u9fa5]{6,7}$/

This regular expression matches from the beginning, and only allows the province to be abbreviated with one Chinese character, followed by A five- or six-digit mixture of letters and numbers. And the license plate number must be 6 or 7 digits in total. Among them, "{6,7}" represents the range of digits in the license plate number.

4. Summary

As mentioned above, the method of using PHP regular expressions to verify the license plate number is divided into three steps:

1. The third step of verifying the license plate number Part - Province abbreviation.
2. Verify the second part of the license plate number - a mixture of letters and numbers.
3. Connect the above two and set their digit range.

This method of using PHP regular expressions to verify license plate numbers is not only simple and efficient, but also has high accuracy. We can modify PHP regular expressions accordingly as needed to meet the needs of different scenarios. At the same time, we also remind everyone that in actual operations, you should pay attention to some specific situations. For example, the license plate number rules for special models such as new energy vehicles will be different.

The above is the detailed content of How to verify license plate number using PHP regular expression. For more information, please follow other related articles on the PHP Chinese website!