replaceAll与escp中的错误

Question

我正在使用这个ocde的开源

private String undoEscape(String searchTerm) {
        String specialChars = "+-&|!(){}[]^\"~:\\";
        for (int i = 0; i < specialChars.length(); i++) {
            String character = specialChars.substring(i, i + 1);
            String escaped = "\\" + character;
            searchTerm = searchTerm.replaceAll(Pattern.quote(escaped), character);
        }
        return searchTerm;
    }

如果在= =

中字符= \

escaped = \\ - 在inspect = \

中

searchTerm \\ n = in inspect = \ n

我收到了错误 怎么了？

java.lang.StringIndexOutOfBoundsException: String index out of range: 1
    at java.lang.String.charAt(String.java:658)
    at java.util.regex.Matcher.appendReplacement(Matcher.java:762)
    at java.util.regex.Matcher.replaceAll(Matcher.java:906)
    at java.lang.String.replaceAll(String.java:2162)
    at org

Answer 1

切换到replace()，这也取代所有次出现，但不需要正则表达式：

private String unescape(String searchTerm) {
    String specialChars = "+-&|!(){}[]^\"~:\\";
    for (char c : specialChars.toCharArray()) {
        String character = String.valueOf(c);
        String escaped = "\\" + character;
        searchTerm = searchTerm.replace(escaped, character);
    }
    return searchTerm;
}