How to add characters to a string in specific indexes?

Question

I have a string formed with 6 letters eg: "abcdef". I need to add "." every two characters so it would be like this: "ab.cd.ef". I'm working in java, I tried this:

private String FormatAddress(String sourceAddress) {
    char[] sourceAddressFormatted = new char[8];
    sourceAddress.getChars(0, 1, sourceAddressFormatted, 0);
    sourceAddress += ".";
    sourceAddress.getChars(2, 3, sourceAddressFormatted, 3);
    sourceAddress += ".";
    sourceAddress.getChars(4, 5, sourceAddressFormatted, 6);
    String s = new String(sourceAddressFormatted);
    return s;
}

But i received strange values such as [C@2723b6.

Thanks in advance:)

For better help sooner, post an SSCCE.

Andrew Thompson
– Andrew Thompson

2013-05-03 08:37:27 +00:00
Commented May 3, 2013 at 8:37 — Andrew Thompson
– Andrew Thompson, Commented May 3, 2013 at 8:37

Jiri Vlasimsky · Accepted Answer · 2013-05-03 08:59:01Z

5

Try regexp:

Input:

abcdef

Code:

System.out.println("abcdef".replaceAll(".{2}(?!$)", "$0."));

Output:

ab.cd.ef

edited May 3, 2013 at 8:59

answered May 3, 2013 at 8:47

Jiri Vlasimsky

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Comments

Evgeniy Dorofeev · Accepted Answer · 2013-05-03 08:46:34Z

1

You should fix it as

    String sourceAddress = "abcdef";
    String s = sourceAddress.substring(0, 2);
    s += ".";
    s += sourceAddress.substring(2, 4);
    s += ".";
    s += sourceAddress.substring(4, 6);
    System.out.println(s);

You also can do the same with regex, it's a one line solution

    String s = sourceAddress.replaceAll("(\\w\\w)(?=\\w\\w)", "$1.");
    System.out.println(s);

answered May 3, 2013 at 8:46

Evgeniy Dorofeev

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Comments

Lai Xin Chu · Accepted Answer · 2013-05-03 08:43:29Z

0

private String formatAddress(String sourceAddress) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < sourceAddress.length(); i+=2) {
        sb.append(sourceAddress.substring(i, i+2));
        if (i != sourceAddress.length()-1) {
            sb.append('.');
        }
    }
    return sb.toString();
}

answered May 3, 2013 at 8:43

Lai Xin Chu

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Comments

Achintya Jha · Accepted Answer · 2013-05-03 09:41:44Z

0

Try this:

String result="";
String str ="abcdef";
for(int i =2; i<str.length(); i=i+2){
     result = result + str.substring(i-2 , i) + ".";
}
result = result + str.substring(str.length()-2);

edited May 3, 2013 at 9:41

answered May 3, 2013 at 8:40

Achintya Jha

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1 Comment

Hanady Over a year ago

The last two letters won't be added this way.

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