带escp的replaceAll中的误差

Question

我在这个ocde中使用了开放源码。

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;
    }

如果字符=\ in case =\

逃脱=\-在检查=\

searchTerm \n = in视察= \n

我犯了错什么错了？

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()，它也会替换所有出现的事件，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;
}