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<?php $selector = 'p:before'; preg_match('~::?(?:first-(?:letter|line)|before|after|selection|value|choices|repeat-(?:item|index)|outside|alternate|(?:line-)?marker|slot\([_a-z0-9+.\\\\-]*\))~i', $selector, $matches); var_dump($matches, $selector);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(7) ":before" } string(8) "p:before"

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