Replace all instances of certain characters within a string [duplicate]

问题

This question already has an answer here:

How to replace multiple substring of a string at one time? (1 answer)

Closed 14 days ago.

I have a string that comes from user: Below is an exact example

var message = "You purchased $name on $date"

Am within a Firebase Listener where variable querySnapshot is carrying data, how can looop through message and replace every occurence of $ to take the variable immediately after $ eg date and make the message be like below

message = "You purchased + querySnapshot.get("name") + on querySnapShot.get("date")

Thoughts: I imagine checking through the string message and finding all occurences of $ and getting the value after them. Then replacing $value with querySnapshot(value)...if you know how how i can implement this, kindly help out.

回答1:

Not sure If this is what you are looking for

public static void main(String[] args) {
        String message  = "You purchased $name on $date";
        String[] arr = message.split(" ");

        for (int i = 0; i < arr.length; i++) {
            String s = arr[i];
            if (s.contains("$")) {
                arr[i] = "+ querySnapshot.get(" + "\"" + s.substring(1) + "\"" + ")";
            }
        }

        System.out.println(String.join(" ", arr));

    }

来源：https://stackoverflow.com/questions/62363893/replace-all-instances-of-certain-characters-within-a-string