Parsing CSS by regex

(?<selector>[A-Za-z]+[s]*)[s]*{[s]*((?<properties>[A-Za-z0-9-_]+)[s]*:[s]*(?<values>[A-Za-z0-9#, ]+);[s]*)*[s]*}

body { background: #f00; font: 12px Arial; }

Array(
    [0] => Array(
            [0] => body { background: #f00; font: 12px Arial; }
            [selector] => Array(
                [0] => body
            )
            [1] => Array(
                [0] => body
            )
            [2] => font: 12px Arial;
            [properties] => Array(
                [0] => font
            )
            [3] => Array(
                [0] => font
            )
            [values] => Array(
                [0] => 12px Arial
                [1] => background: #f00
            )
            [4] => Array(
                [0] => 12px Arial
                [1] => background: #f00
            )
        )
)

Array(
    [0] => Array
        (
            [0] => body { background: #f00; font: 12px Arial; }
            [selector] => body
            [1] => body
            [2] => font: 12px Arial;
            [properties] => font
            [3] => font
            [values] => 12px Arial
            [4] => 12px Arial
        )
    )

/([^{])s*{s*([^}])s*}/

$cssp = new cssparser;
$cssp -> ParseStr("body { background: #f00;font: 12px Arial; }");
print_r($cssp->css);

Array
(
    [body] => Array
        (
            [background] => #f00
            [font] => 12px arial
        )
)

$css_array = array(); // master array to hold all values
$element = explode('}', $css);
foreach ($element as $element) {
    // get the name of the CSS element
    $a_name = explode('{', $element);
    $name = $a_name[0];
    // get all the key:value pair styles
    $a_styles = explode(';', $element);
    // remove element name from first property element
    $a_styles[0] = str_replace($name . '{', '', $a_styles[0]);
    // loop through each style and split apart the key from the value
    $count = count($a_styles);
    for ($a=0;$a<$count;$a++) {
        if ($a_styles[$a] != '') {
            $a_key_value = explode(':', $a_styles[$a]);
            // build the master css array
            $css_array[$name][$a_key_value[0]] = $a_key_value[1];
        }
    }
}

Array
(
    [body] => Array
        (
            [background] => #f00
            [font] => 12px arial
        )
)

function trimStringArray($stringArray){
    $result = array();
    for($i=0; $i < count($stringArray); $i++){
        $trimmed = trim($stringArray[$i]);
        if($trimmed != '') $result[] = $trimmed;
    }
    return $result;
}
$regExp = '/{|}/';
$rawCssData = preg_split($regExp, $style);

$cssArray = array();
for($i=0; $i < count($rawCssData); $i++){
    if($i % 2 == 0){
        $cssStyle['selectors'] = array();
        $selectors = split(',', $rawCssData[$i]);
        $cssStyle['selectors'] = trimStringArray($selectors);
    }
    if($i % 2 == 1){
        $attributes = split(';', $rawCssData[$i]);
        $cssStyle['attributes'] = trimStringArray($attributes);
        $cssArray[] = $cssStyle;
    }

}
//return false;
echo '<pre>'."n";
print_r($cssArray);
echo '</pre>'."n";

(?<selector>(?:(?:[^,{]+),?)*?){(?:(?<name>[^}:]+):?(?<value>[^};]+);?)*?}