获取java。util。正则表达式。使用replaceAll方法时的PatternSyntaxException

Question

我试图使用replaceAll方法替换文本，但出现此错误

Caused by: java.util.regex.PatternSyntaxException: Illegal repetition near index 0
${rate+0.0020D2}

这是我的密码

String regExp = "\\$\\{rate[+-]\\d+(\\.\\d+)D[0-9]\\}";
String text = "${rate+0.0020D2},banana,${rate-0.4002D3},${rate+0.2003D4},${rate+bananD4},${rate+.123.415D4}";

Pattern pattern = Pattern.compile(regExp);
Matcher matcher = pattern.matcher(text);

String match = null;

List<String> matches = new ArrayList<String>(5);
while (matcher.find()) {

    int startIndex = matcher.start();
    int endIndex = matcher.end();
    match = matcher.group();
    matches.add(match.substring(2, match.length() - 1));

}
String[] results = matches.toArray(new String[0]);
for(int i=0;i <= results.length;i++){
text.replaceAll(results[i],"<span class=\"rate\""+i+">"+results[i]+ "</span>");
}

如果我使用text.replaceAll("\\$\\{rate+0.0020D2\\}","<span class=\"rate\""+i+">"+results[i]+ "</span>");，我可以解决这个问题

但我不能这样做，因为我的值是可变的。有什么解决办法吗

Answer 1

正则表达式是${rate+0.0020D2}。你需要逃离它：

text.replaceAll(Pattern.quote(results[i]),"<span class=\"rate\""+i+">"+results[i]+ "</span>");