How to use PHP regular expression to verify whether the input string is in the correct TV shopping number format

With the popularity of TV shopping, the verification of TV shopping number format has also become a problem that needs to be solved. This article will introduce how to use PHP regular expressions to verify whether the input string is in the correct TV shopping number format.

1. TV shopping number format

TV shopping numbers usually consist of the following three parts:

1. Brand number: usually four digits, such as "0563" , "1359" etc.
2. Product number: usually three to four digits, such as "001", "1002", etc.
3. Batch number: usually two digits, such as "01", "09", etc.

There are no spaces or other symbols between the above three parts of the number. If they are directly connected together, it is the correct TV shopping number format, such as "0563001058".

2. Use PHP regular expressions to verify the TV shopping number format

1. preg_match() method
   The preg_match() method in PHP can be used for regular expressions For verification, the syntax is:

   preg_match($pattern, $subject, $matches);

where $pattern is the regular expression pattern and $subject is The string to be matched, $matches is the matching result.

2. Building a regular expression pattern
   By analyzing the TV shopping number format, we can get the regular expression pattern as:

   /^[0-9] {4}[0-9]{3,4}[0-9]{2}$/

where, ^ and $ indicate that the string must start with the brand number and end with The end of the batch number; [0-9] means matching numbers from 0 to 9; {4} means matching the previous expression four times, {3,4} means matching the previous expression 3 to 4 times.

3. PHP code implementation
   We pass the above regular expression pattern and the string to be verified as parameters into the preg_match() method, and determine whether the returned matching result is 1 can realize the verification of TV shopping number format. The sample code is as follows:

   $pattern = '/^[0-9]{4}[0-9]{3,4}[0-9]{2}$/'; //regular expression Formula pattern
   $string = '0563001058'; //String to be verified
   if (preg_match($pattern, $string)){ //The matching result is 1

    echo '该字符串为有效的电视购物号码格式';

   } else {

    echo '该字符串不是有效的电视购物号码格式';

   }

Through the above code, we can simply verify the format of the TV shopping number.

3. Summary

Regular expression is a powerful tool that can be used for string matching, replacement, extraction and other operations. In PHP, the preg_match() method can easily verify regular expressions. This article takes the TV shopping number format as an example to introduce how to use PHP regular expressions to verify whether the input string is the correct TV shopping number format. I hope to be helpful.

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