PHP regular expression to verify mobile phone number format

PHP, as a general scripting language, is often used to develop Web applications. Among them, format verification of mobile phone numbers is one of the issues that developers often need to deal with. In this article, we will introduce how to use PHP regular expressions to validate mobile number format.

Regular Expression, also known as regular representation, is a text pattern and a grammatical rule used to describe characters. Regular expressions are a powerful tool that can help us match and find text quickly. In the process of validating mobile phone numbers, we can use regular expressions to determine whether the entered text conforms to the specified format.

The following is a simple PHP regular expression example:

$pattern = '/[0-9]{11}/';
$phone_number = '13512345678';
if (preg_match($pattern, $phone_number)) {
    echo "手机号码格式正确！";
} else {
    echo "手机号码格式不正确！";
}

In the above example, we use the preg_match() function to compare the mobile phone number with the specified format, and if it matches, output " The mobile phone number format is correct!", otherwise it outputs "The mobile phone number format is incorrect!". Where $pattern is the regular expression we defined, which represents an 11-digit sequence. $phone_number is the mobile phone number we want to check. If it matches the format defined by $pattern, "The mobile phone number format is correct!" will be displayed.

Now, let us take a closer look at how to design a correct regular expression to match mobile phone numbers that meet the rules.

In China, mobile phone numbers are 11 digits starting with 1. Since the allocation of phone number segments is different in each region, there are different regular expressions to match various number segments. When writing a regular expression that matches multiple number segments, we need to increase the matching number segments step by step from simple to complex.

For example: Since the number segments 133, 153, 180, 181, 189 and 177 are all 11-digit numbers, we can write the regular expression like this:

$pattern = '/^1(33|53|77|80|81|89)[0-9]{8}$/';

In the above regular expression In the formula, ^ represents the beginning, $ represents the end, | in brackets represents or, [0-9] represents any number, {8} represents matching 8 numbers. The meaning of this regular expression is: starting with 1, followed by 133, 153, 177, 180, 181, 189, and finally followed by a string of 8 digits.

The following is a detailed explanation of regular expressions:

• ^: Matches the beginning of the string.
• 1: Represents starting with the number 1.
• (33|53|77|80|81|89): The or syntax in brackets represents the optional number segment.
• [0-9]: represents matching any number.
• {8}: represents matching 8 numbers.
• $: Matches the end of the string.

Through the above regular expression, we can effectively verify whether the format of the mobile phone number is correct. When developing web applications, we can apply this regular expression to the mobile phone number verification form to make the form data conform to the format we specify and ensure the validity of the data.

In the actual development process, we also need to write and match flexible regular expressions according to relevant needs to match different Chinese mobile phone number formats. In short, understanding and mastering regular expressions is one of the important methods to maintain data validity, and is very practical and necessary when developing Web applications.

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