如何在Java中使用正则表达式替换字符串中的数字？

Question

我有像这样的字符串

"{"name:John","Age:15","width:500","height:300"},{"name:Mike","Age:25","width:600","height:400"}";

我如何在宽度和高度之后替换数字，就像这样

"{"name:John","Age:15","width:100","height:100"},{"name:Mike","Age:25","width:100","height:100"}";

由于

Answer 1

使用此正则表达式进行搜索：

(width|height):\d+

并替换为：

$1:100

RegEx Demo

<强>爪哇：

str = str.replaceAll("(width|height):\\d+", "$1:100");

Answer 2

在Java中，我们可以在后视（see Java takes things a step further by allowing finite repetition）中使用备选列表，它们的长度不必相同：

String str = "\"{\"name:John\",\"Age:15\",\"width:500\",\"height:300\"},{\"name:Mike\",\"Age:25\",\"width:600\",\"height:400\"}\";";
System.out.println(str.replaceAll("(?i)(?<=width:|height:)\\d+", "100"));

输出demo program：

"{"name:John","Age:15","width:100","height:100"},{"name:Mike","Age:25","width:100","height:100"}";