i.e.
$text = 'remove this text (keep this text and 123)';
echo preg_replace('', '', $text);
它应该输出：
(keep this text and 123)
这将做到这一点：（并且适用于嵌套()以及）
$re = '/[^()]*+(\((?:[^()]++|(?1))*\))[^()]*+/';
$text = preg_replace($re, '$1', $text);
这里有几个测试用例：
Input:
Non-nested case: 'remove1 (keep1) remove2 (keep2) remove3'
Nested case: 'remove1 ((keep1) keep2 (keep3)) remove2'
Output:
Non-nested case: '(keep1)(keep2)'
Nested case: '(keep1) keep2 (keep3)'
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