PHP - Help writing regex?

I am trying to pick up regex using nettuts. However I still haven't got very far and something need's fixing today.

I need a regex that does the following.

$html = '...'; // Lots of HTML
$regex = '{absolutely anything}color: #{6 digits - [0-9][a-f][A-F]};{absolutely anything}';

I will then use this to force users to have a certain color on their HTML elements.

Would an开发者_Python百科yone mind converting the $regex variable to actual regex?

You're pretty close.

/color:\s*\#[A-Fa-f0-9]{6};/

If you want "absolutely anything" then... don't add anything else! You can use quantificator and classes for the rest :

$regex = '/color: #[a-fA-F0-9]{6};/'

[a-fA-F0-9] matches any character between a-f (lowercase), A-F (uppercase) and a digit. {6} means it must has exactly 6 characters.
Don't forget that with PHP's PCRE extension, you need delimiters (/) in this case).

/color: ?#([0-9a-f]{3}){1,2};/i

Features:

• Optional whitespace between color: and value
• #rgb and #rrggbb matching

Furthermore, you might want to add a [^-] part in order not to match background-color: #...: /[^-]color: ?#([0-9a-f]{3}){1,2};/i. Also, you could use a negative lookbehind if you so desire: (?<!-).