How to remove String from another String?

Question

I want to remove a string from another string, not all the letters.

example: "hello world my name is john"
removing: "ewo"
result: "hllo rld my name is john"

my program deletes all the letters that are from removing

String text = "hello world my name is john";
    int num = 1;

    for (int i = 0; i < num; i++) {
        String del = ewo;

        String[] delArray = del.split("");

        for (int j = 0; j < delArray.length; j++) {

            text = text.replace(delArray[j], "");
        }
        System.out.println(text);
    }

My program return: "hll rld my nam is jhn", but that's not what I need

Answer 1

Try this

String text = "hello world my name is john";
int num = 1;

for (int i = 0; i < num; i++) {
    String del = ewo;

    String[] delArray = del.split("");

    for (int j = 0; j < delArray.length; j++) {

        text = text.replaceFirst(delArray[j], "");
    }
    System.out.println(text); //output => hll orld my name is john
}

Answer 2

From your preferred output, I take it you want to replace only the first matching character. Luckily, Java has a method for this.

Replace this line:

text = text.replace(delArray[j], "");

With this one:

text = text.replaceFirst(delArray[j], "");

And it now only removes the first matching character, as desired.

Answer 3

You can use replaceFirst() instead of replace().It will remove the first occurrency matching with your input.

Answer 4

System.out.prinln("hello world my name is john".replace("orld",""));

Answer 5

You can use replaceFirst() or you can use three loops each for removing e, w, and o and use a break statement thereafter.

Answer 6

This might be what you want

public static void main(String[] args) {
    String str1 = "hello world my name is john";
    String str2 = "ewo";

    int currentCharIndex = 0;
    StringBuilder resultBuilder = new StringBuilder();
    for (char c : str1.toCharArray()) {
        if (currentCharIndex >= str2.length() || c != str2.charAt(currentCharIndex)) {
            resultBuilder.append(c);
        } else {
            currentCharIndex++;
        }
    }
    System.out.println(resultBuilder.toString());
}