How to remove a substring from a string without using replace() method?

Question

String string = "yesnoyesnoyesnoyesno";
String substring = "no";

How do I remove every occurrence of the substring from the string so it ends up being "yesyesyesyes"?

score 4 · Answer 1 · answered Oct 02 '20 at 05:01

If you are using Java 8+, then you could try splitting the input on "no" and then joining the resulting array together into a string:

String string = "yesnoyesnoyesnoyesno";
string = String.join("", string.split("no"));
System.out.println(string);

This prints:

yesyesyesyes

score 0 · Answer 2 · answered Oct 02 '20 at 05:08

0

This doesn't use the replace(), so technically it meets the brief:

String str = string.replaceAll("no", "");

answered Oct 02 '20 at 05:08

Bohemian

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Oh come on... it's legit! – Bohemian Oct 02 '20 at 05:08
Actually, AFAIK `replace` uses `replaceAll` under the hood. – Tim Biegeleisen Oct 02 '20 at 05:30
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@Tim no. it uses Matcher's replaceAll(), which in turn uses StringBuilder's appendReplacement(), which doesn't even work with strings, but chars. – Bohemian Oct 02 '20 at 05:33

score 0 · Answer 3 · answered Oct 02 '20 at 05:37

0

    String input = "yesnoyesnoyesno";   
    String output="";
    for(String token : input.split("no") )
        output = output.concat(token);      
    System.out.println(output);

It prints:

yesyesyesyes

answered Oct 02 '20 at 05:37

Zahid Khan

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How to remove a substring from a string without using replace() method?

3 Answers3