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Q:

PHP preg_match_all regular expression to get pixel values (with "px") from css

Hi there,

I'm currently working on a CSS file and I need to extract all the pixel values (those ending with "px") from the file using PHP's preg_match_all function. I've been browsing through the PHP documentation, but I'm having trouble writing the correct regular expression for this specific task.

It would be great if someone could guide me on how to construct a regular expression that can match and extract all pixel values (e.g., 10px, 20px, etc.) from a CSS file. I'm specifically interested in capturing the numeric value followed by the "px" unit.

Any help or suggestions would be greatly appreciated. Thank you in advance!

Best,
[Your Name]

All Replies

colin90

Hey there,

I encountered a similar requirement in the past, and let me share my experience with you. When it comes to using preg_match_all in PHP to extract pixel values from a CSS file, a regular expression that worked well for me was: `\b(\d+)px\b`. Here's a breakdown of the expression:

- `\b` asserts a word boundary, ensuring we capture complete pixel values and not partial matches.
- `(\d+)` captures one or more digits as the numeric value.
- `px` matches the literal characters "px" after the numeric value.

To implement this, you can try the following code snippet:

php
$cssContent = file_get_contents('path/to/your/css/file.css');
preg_match_all('/\b(\d+)px\b/', $cssContent, $matches);

$pixelValues = $matches[0];


Don't forget to replace `'path/to/your/css/file.css'` with the actual path to your CSS file. Additionally, ensure you have the right file permissions set.

Give it a go and let me know if it works for you or if you need further assistance. Good luck!

Best regards,
[Another User]

wunsch.rodger

Hey [Your Name],

I had a similar requirement a while back, and I can share my experience with you. When it comes to extracting pixel values from a CSS file using preg_match_all, the regular expression I found effective was `/(\d+)px/`. Let me break it down for you:

- `(\d+)` captures one or more digits. This will match the numeric value before "px".
- `px` is a literal match for the characters "px" after the numeric value.

Here's an example of how you can use preg_match_all to extract the pixel values from a CSS file:

php
$cssContent = file_get_contents('path/to/your/css/file.css');
preg_match_all('/(\d+)px/', $cssContent, $matches);

$pixelValues = $matches[0];


In this case, `$matches[0]` will contain an array of all the pixel values found in the CSS file.

Remember to replace `'path/to/your/css/file.css'` with the actual path to your CSS file. Also, ensure that you have the correct file permissions set.

I hope this solution works for you as well. Let me know if you have any other questions or need further assistance.

Best regards,
[Another User]

xconsidine

Hello,

I faced a similar requirement not too long ago, and I'd be glad to share my approach with you. Extracting pixel values from a CSS file using preg_match_all in PHP can be achieved with a regular expression like `/([0-9]+)px/`. Here's how it works:

- `([0-9]+)` captures one or more digits as the numeric value before "px".
- `px` matches the literal characters "px" following the numeric value.

Below is an example of how you can implement this:

php
$cssFile = file_get_contents('path/to/your/css/file.css');
preg_match_all('/([0-9]+)px/', $cssFile, $matches);

$pixelValues = $matches[0];


Just remember to replace `'path/to/your/css/file.css'` with the actual path to your CSS file. Make sure you have appropriate file permissions too.

Give it a try and let me know if it works for you or if you need further assistance. I'm here to help!

Best regards,
[Another User]

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