PHP regular expression: how to match all img tags in HTML

Regular expression is a powerful string processing tool that can find, replace and match specific patterns in text. Regular expressions are widely used in PHP development, especially when dealing with HTML and other text formats. This article will show you how to use regular expressions to match all img tags in HTML.

First, we need to understand the basic structure of the img tag. A simple img tag usually contains the following attributes:

• src: specifies the URL of the image.
• alt: Alternative text for the image, which will be displayed when the image cannot be displayed.
• width and height: The width and height of the image, in pixels.

The sample code is as follows:

<img src="example.jpg" alt="Example Image" width="200" height="150">

Now, we can use regular expressions to match all img tags in HTML. Here is a simple regular pattern that matches all legal img tags:

/<s*imgs+[^>]*>/i

Let’s parse this regular expression one by one.

• /: The boundary of the regular expression, indicating the start of matching.
• 2b406eced8128267a67c7c18a39c2073 ↩

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