CODEWITHSUNDEEP
javastringchar
Mirkland
Mirkland

Reputation: 9

Doubling each word or number combination in a String

I'm trying to get each word and/or number/symbol combination input in a string doubled in this way:

My name is >> My My name name is is
148 !! 697 >> 148 148 !! !! 697 697
The code is 428 >>  The The code code is is 428 428

I've spent a while with this and I just can't seem to figure out how to get the doubling to work properly or keep the doubled parts separated from one another.

Upvotes: 0

Views: 123

Answers (4)

Tunaki
Tunaki

Reputation: 137259

Using, a regular expression, you can do this quite simply. The following groups all characters that aren't whitespace (\S) and replaces them by themselves twice, using the back-reference $1.

public static void main(String[] args) {
    String[] str = { "My name is", "148 !! 697", "The code is 428" };
    Pattern pattern = Pattern.compile("(\\S+)");
    for (String s : str) {
        String res = pattern.matcher(s).replaceAll("$1 $1");
        System.out.println(res);
    }
}

This prints

My My name name is is
148 148 !! !! 697 697
The The code code is is 428 428

Upvotes: 3

billjamesdev
billjamesdev

Reputation: 14640

By word, I assume you mean space-separated item?

String doubleit(String inpString) {
    List<String> doubles = new ArrayList<String>();
    String [] items = inpString.split();
    for ( String item : items ) {
        doubles.add( item );
        doubles.add( item );
    }
    return doubles.join( " " );
}

Upvotes: 0

ernest_k
ernest_k

Reputation: 45339

String phrase = "My name is";
StringBuilder result = new StringBuilder();
for(String word : phrase.split(" ")) {
    result.append(word).append(" ").append(word).append(" ");
}

String finalResult = result.toString().trim(); //trim() removes the last, extraneous space.

Upvotes: 1

John Chang
John Chang

Reputation: 131

Loop though the string and for each word append it two times to a new mutable string.

Upvotes: 0

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