In Java how to replace Number and Decimal with string

Question

I am having the below string.

Functions.substring(Functions.test(1,Functions.test("TestString1")),0.9,0,"TestString2",true)

In the above string, I want to replace Numbers(0 and 1 as in the above example) as Integer. And Float Values(Ex: 0.9) as Decimal and String(EX: "TestString1" and "TestString2") as String.

Result: Functions.substring(Functions.test(Integer,Functions.test(String)),Decimal,Integer,String,true)

I tried with replace function using below regex but it is not working.

decimal: ^[+-]?\d+(\.\d+)?$
number : ^-?(0|[1-9]\d*)(\d+)?$
String : ".*?"

Below is the java code:

public static void main(String[] args) {

                System.out.println("Functions.substring(Functions.test(1,Functions.test(\"TestString1\")),0.9,0,\"TestString2\",true)".replaceAll("^-?(0|[1-9]\\d*)(\\d+)?$", "Intger"));
    }

but it is not working is no error description. What is what you get? — Jens
– Jens, Commented Dec 4, 2019 at 11:20
First problem is that you can't use "^" and "$" because they mean beginning a end of a line which is the entire string in this case, but in your sample text you have text before and after the numbers you want to replace. — Constantino Cronemberger
– Constantino Cronemberger, Commented Dec 4, 2019 at 11:52
It appears that your intention is to identify and then replace certain values within a String using regular expressions in Java. Are other approaches (languages, tools) also possible for you? If so, then you should restate the problem using less specific implementation details. A simpler example of your difficulty will be clearer for the reader. — mleonard
– mleonard, Commented Dec 4, 2019 at 13:20

pringi · Accepted Answer · 2019-12-04 11:47:10Z

0

For the Integer part you have to do something like this:

System.out.println("Functions.substring(Functions.test(1,Functions.test(\"TestString1\")),0.9,99,\"TestString2\",true)".replaceAll("(?<=\\(|,)\\d+(?=\\)|,|$)", "Intger"));

For Decimal and String you have to adapt the code.

Probably you will be better served with Pattern and Matcher. An example here.

answered Dec 4, 2019 at 11:47

pringi

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