Unable to replace a string with another string in java using regex-CodePudding

I have a string and want to replace certain charactes in it. Input String = "abc test=0 test1=123 test2=764" Output String = "abc test=$test test1=$test1 test2=$test2"

I have tried couple of things using replace and replaceAll in java. For example :

String abc = directiveValue.replaceAll("test%", test "=$" test);

String abc = directiveValue.replaceAll("test[.*]", test "=$" test);

CodePudding user response：

You could match:

(test\d*)=\S*

Regex demo

And replace with the dollar sign between the 2 capture groups $1=\$$1

System.out.println(
    "abc test=0 test1=123 test2=764"
        .replaceAll(
          "(test\\d*)=\\S*",
          "$1=\\$$1"
        )
);

Output

abc test=$test test1=$test1 test2=$test2

CodePudding user response：

We can use a regex replacement:

String input = "abc test=0 test1=123 test2=764";
String output = input.replaceAll("(\\w )=\\w ", "$1=\\$$1");
System.out.println(output);

// abc test=$test test1=$test1 test2=$test2

CodePudding user response：

Using VScode, I will use this (test)(\d?)(=)(\b. ?\b)
and replace with $1$2$3$test$2

I hope it inspires you with your java implementation. :)