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<?php $str = "唧"; preg_match("/[\x{ffffffff}]+/u", $str, $mt); print_r($mt);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_match(): Compilation failed: character code point value in \x{} or \o{} is too large at offset 12 in /in/drC77 on line 3

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