Java正则表达式替换文本中的字符串

Question

我有一个大字符串，我将在其中看到一系列数字。我必须在数字前面附加一个字符。让我们举个例子。我的字符串是..

String s= "Microsoft Ventures' start up \"98756\" accelerator wrong launched in apple in \"2012\" has been one of the most \"4241\" prestigious such programs in the country.";

我正在寻找一种在Java中在每个数字前面添加一个字符的方法。所以我希望修改后的字符串看起来像......

String modified= "Microsoft Ventures' start up \"x98756\" accelerator wrong launched in apple in \"x2012\" has been one of the most \"x4241\" prestigious such programs in the country.";

如何在 Java 中做到这一点？

Answer 1

查找数字部分的正则表达式将为"\"[0-9]+\""。我要做的方法是按单词循环原始字符串，如果单词与模式匹配，则替换它。

String[] tokens = s.split(" ");
String modified = "";
for (int i = 0 ; i < tokens.length ; i++) {
    // the digits are found
    if (Pattern.matches("\"[0-9]+\"", tokens[i])) {
        tokens[i] = "x" + tokens[i];
    }
    modified = modified + tokens[i] + " ";
}

代码只是给你一个想法，请自行优化(使用StringBuilder连接字符串等)。