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Regex to match a CSS class name
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Regex to match a CSS class name
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I am trying to write a regex that matches a valid CSS class name structure. I have this so far:
$pattern = "([A-Za-z]*\.[A-Za-z]+\s*{)";
$regex = preg_match_all($pattern, $html, $matches);
However, a class name can be in the following formats that my regex won't match:
p.my_class{
}
p.thisclas45{
}
These are just some cases, I've looked around to find the rules of how you can name a class in a style block but couldn't find anything. Anyone know where the rules for the class naming conventions are?
Are there any more cases that I need to consider? What regex would you use to match a class name?
I have already narrowed it down to a style block using the PHP DOM Document class.
Have a look at http://www.w3.org/TR/CSS21/grammar.html#scanner
According to this grammar and the post Which characters are valid in CSS class names/selectors? this should be the right pattern to scan for css classes:
\.-?[_a-zA-Z]+[_a-zA-Z0-9-]*\s*\{
Note: Tag names are not required as prefix for classes in css. Just .hello { border: 1; } is also valid.
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