문자열에서 한글과 영문자만 골라내기

$alphabet = 'A-Za-z';
$hangul_jamo = '\x{1100}-\x{11ff}';
$hangul_compatibility_jamo = '\x{3130}-\x{318f}';
$hangul_syllables = '\x{ac00}-\x{d7af}';

$cnt = preg_match_all('/['.$alphabet.$hangul_jamo.$hangul_compatibility_jamo.$hangul_syllables.']+/u', $utf8text, $matches);

print_r($matches);