如何在Java中使用正则表达式替换字符串中的数字？

Question

I have String like this

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

how i can replace the numbers just after width and height to be like this

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

Thanks

Answer 1

Search using this regex:

(width|height):\d+

and replace with:

$1:100

RegEx Demo

Java:

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

Answer 2

In Java, we can use a list of alternatives in a look-behind ( see Java takes things a step further by allowing finite repetition ), and their length does not have to be identical:

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"));

Output of a demo program :

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