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<?php $t = 'lang="cs-CZ"'; var_dump(preg_match("~lang=(\"|')cs(_\-)cz(\"|')~i", $html, $langPreg));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $html in /in/c0qIq on line 4 Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /in/c0qIq on line 4 int(0)

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