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Q:

Regular expression to get particular class name from a tag in php

Hey folks,

I'm currently working on a PHP project and I'm facing a small issue. I have a tag element in my HTML and I want to extract a particular class name from it. I've been trying to figure out the regular expression for it, but no luck so far.

Let me explain with an example. Suppose I have the following HTML tag:

```html
<div class="my-element red active">Lorem ipsum dolor sit amet</div>
```

Now, I want to extract the class name "red" from this tag using regular expressions in PHP. I know that the class name will always be preceded by the word "my-element".

I would really appreciate it if someone could help me with the regex pattern to achieve this. Thank you in advance!

Best,
[Your Name]

All Replies

goldner.deja

Hey [Your Name],

I understand your frustration with regular expressions, they can be a bit tricky. Fortunately, I had a similar situation before and managed to solve it. Here's the regex pattern that should do the trick for you:

php
$regex = '/my-element\s+(\w+)/';


Let me explain it for you. In this pattern, we are searching for the string "my-element" followed by one or more whitespace characters (\s+). Then, we capture the following word characters (\w+) which represent the class name you want to extract.

To extract the class name in PHP, you can use the `preg_match` function like this:

php
$htmlTag = '<div class="my-element red active">Lorem ipsum dolor sit amet</div>';
$regex = '/my-element\s+(\w+)/';
preg_match($regex, $htmlTag, $matches);
$className = isset($matches[1]) ? $matches[1] : '';


In the above code, `$matches[1]` will contain the extracted class name "red". Make sure to check if $matches[1] is set before using it to avoid any errors.

I hope this helps you solve your problem. Let me know if you have any further questions!

Best,
[Your Name]

ferne48

Hey there, [Your Name].

I totally get what you're going through. Regex can be quite perplexing, but fret not! I had a similar requirement in one of my PHP projects, and I came up with a regex pattern that might help you out.

Here's the pattern you can give a shot:

php
$regex = '/class="my-element\s+\K[^"\s]+/';


Let me break it down for you. This regex looks for the string `class="my-element`, followed by one or more whitespace characters (`\s+`). The `\K` is a special construct that resets the starting point of the match, effectively ignoring the previous matched characters. Finally, `[^"\s]+` captures any sequence of characters that are not whitespace or double quotes, which corresponds to the class name you want.

To extract the class name in PHP using `preg_match`, you can use the following code:

php
$htmlTag = '<div class="my-element red active">Lorem ipsum dolor sit amet</div>';
$regex = '/class="my-element\s+\K[^"\s]+/';
preg_match($regex, $htmlTag, $matches);
$className = isset($matches[0]) ? $matches[0] : '';


In this code, `$matches[0]` stores the extracted class name (`red` in this case). As always, remember to check if `$matches[0]` is set before using it to avoid any potential issues.

I hope this approach works well for you. Feel free to ask if you have any further queries!

Best regards,
[Your Name]

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