java正则表达式对特殊字符的转义以及异常现象

'$', '(', ')', '*', '+', '.', '[', ']', '?', '\\', '^', '{', '}', '|'

public static void main(String[] args) {
    String str = "a|b|c";
    // 错误示范
    // str.split("|");
    //
    // 正确的写法，应该在需要转义的字符前加上 "\\"
    String[] split = str.split("\\|");
    for (String s : split) {
        System.out.print(s + " "); // 控制台打印 a b c
    }
}

'$', '(', ')', '*', '+', '.', '[', ']', '?', '\\', '^', '{', '}', '|'

/**
 * 转义正则特殊字符 （$()*+.[]?\^{},|）
 * 
 * @param keyword
 * @return
 */
public static String escapeExprSpecialWord(String keyword) {
	if (StringUtils.isNotBlank(keyword)) {
		String[] fbsArr = { "\\", "$", "(", ")", "*", "+", ".", "[", "]", "?", "^", "{", "}", "|" };
		for (String key : fbsArr) {
			if (keyword.contains(key)) {
				keyword = keyword.replace(key, "\\" + key);
			}
		}
	}
	return keyword;
}

    /**
     * @author Longchengbin
     * @description 将网址反斜杠转成正斜杠并将中文转为16进制字符
     * @since 2020-11-4 16:33
     **/
    public static String decode(String url) {
        String[] strings = url.split("\\\\");
        String s1 = strings[strings.length - 1];
        String s2 = strings[strings.length - 3];
        String s = "";
        try {
            //将反斜杠替换成正斜杠
            s = url.replaceAll("\\\\", "/").
                    //将中文转成16进制字符
                            replace(s1, URLEncoder.encode(s1, "utf-8")).replace(s2, URLEncoder.encode(s2, "utf-8"));
            LogUtils.w(s);
        } catch (UnsupportedEncodingException e) {
            LogUtils.e("网址转换报错：" + e.toString());
        }
        return s;
    }