function custom_filter_wpcf7_is_tel( $result, $tel ) {
$result = preg_match( '/^(0|\+84)(\s|\.)?((3[2-9])|(5[689])|(7[06-9])|(8[1-689])|(9[0-46-9]))(\d)(\s|\.)?(\d{3})(\s|\.)?(\d{3})$/', $tel );
return $result;
}
add_filter( 'wpcf7_is_tel', 'custom_filter_wpcf7_is_tel', 10, 2 );
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