PHP Regular Expression: How to match all buttons in HTML

In HTML, the button element plays a very important role. Buttons allow users to easily interact with web pages, enabling various functions. However, for developers, sometimes it is necessary to match all button elements in HTML to implement some customized operations. At this time, PHP regular expressions can come in handy.

Regular expression is a special string matching tool that can match specific strings in text according to certain rules. In PHP, the regular expression matching function can be implemented using the preg_match() function.

So, how to use regular expressions to match all button elements in HTML? Below, we will introduce it step by step.

1. Determine the matching pattern

First, you need to determine the pattern to match. In HTML, button elements are typically represented by the , , or tags. Therefore, you can use the following regular expression to match these elements:

<button.*?>.*?</button>|<input[^>]+type="button".*?>|<input[^>]+type="submit".*?>

This regular expression mainly includes three parts:

• ?>.?

: Match the content between the opening tag and the closing tag of .

1 type="button".*?>: Matches the case where the type attribute in the element is "button".

1 type="submit".*?>: Matches the case where the type attribute in the element is "submit".

2. Use the preg_match() function to match

After determining the matching mode, you can use the preg_match() function to match. You can store the HTML code to be matched in a string variable, then use the preg_match() function to perform the match, and finally store the matching results in an array. The code is as follows:

$html = '

点击'; preg_match_all('/<button.*?>.*?</button>|<input[^>]+type="button".*?>|<input[^>]+type="submit".*?>/', $html, $matches); print_r($matches[0]);

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The output result is as follows:

Array
(
    [0] => <button>点击</button>
    [1] => <input type="button" value="按钮">
    [2] => <input type="submit" value="提交">
)

Through index 0 of the array $matches, you can get all matching strings, that is, all button elements in HTML.

Summary

In PHP, using regular expressions to match all button elements in HTML requires two steps: determining the matching mode and using the preg_match() function for matching. In this way, you can easily match button elements in HTML, making it convenient for developers to perform custom operations.

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