characters after .contains

[worldly cliff]

How can I check if a string has something in it, .contains("something") and if it does, get x amount of characters after that thing?

[velvet kindle]

Hey, @worldly cliff!
Please remember to /close this post once your question has been answered!

[cold rose]

If you look at the source code of contains the method simply refers to String#indexOf which returns the index of the first occurrence of the specified substring. To get the remaining characters of the String after the first occurrence you can do
lengthOfInitialString - indexOfSubstring - lengthOfSubstring

This only works if you want the characters after the first occurrence of the substring not the last.

[worldly cliff]

ah, I see, is there a way I can do this and get every character after it as long as the next character is a number?

[cold rose]

then I would resort to using String#substring. You start at the index of the first occurrence + the length of the substring you searched for. Convert that substring to a char Array and use Character#isDigit to check each character in a for loop. For each character that is a digit you can concatenate it to another String which will then be your result

[warm obsidian]

    public static String getstring(String s,String containing) {
        String retrn = "";
        char[] chararray = s.toCharArray();
        int start = s.lastIndexOf(containing);
        if(start = -1) {
            //it doesnt contain 
        }
        for(int i = 0;i<s.length();i++) {
            Character car = chararray[i];
            if(!Character.isDigit(car)) {
                retrn+=car;
            }
        }
        return retrn;
    }
``` it not best solution but maybe good for understanding

if u want to stop after charecter is digit then add else {break;}

[cold rose]

just a little thing to add to that. String concatenation in a loop should be avoided if possible. Have a look at StringBuilder.

[warm obsidian]

oh why tho is there any reason? idk how we can add to strings i thought they were not permutable

[cold rose]

yes you are correct they are immutable. That is the reason why manual String concatenation is considered bad practice in a for loop because it creates unnecessary overhead.

[worldly cliff]

ok thx