docs: public static boolean isMatch(String regex, CharSequence content) {
  		if (content == null) {
  			// 提供null的字符串为不匹配
  			return false;
  		}
  
  		if (StrUtil.isEmpty(regex)) {
  			// 正则不存在则为全匹配
  			return true;
  		}
  
  		// Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
  		final Pattern pattern = PatternPool.get(regex, Pattern.DOTALL);
  		return isMatch(pattern, content);
  	}