Inserting Newline character before every number occurring in a string?

Question

I have String of format something like this

String VIA = "1.NEW DELHI 2. Lucknow 3. Agra";

I want to insert a newline character before every digit occurring succeeded a dot so that it final string is like this

String VIA = "1.NEW DELHI " +"\n"+"2. Lucknow " +"\n"+"3. Agra";

How can I do it. I read Stringbuilder and String spilt, but now I am confused.

You may find this useful: http://stackoverflow.com/questions/5884353/insert-a-character-in-a-string-at-a-certain-position — AntonH, Apr 28 '14 at 20:52
I read that before adding the question. In that question you know where to place that specific character but in my problem I don't know where to place it. — user2963317, Apr 28 '14 at 20:55
@user2963317 My answer should only look for digits followed by dots — Oskar Kjellin, Apr 28 '14 at 21:27
@user2963317 Please put a check mark (on the left side of my answer) if you found it useful and at the same time upvote it as well. — , Apr 30 '14 at 02:42

score 2 · Accepted Answer · answered Apr 28 '14 at 20:54

2

Something like:

StringBuilder builder = new StringBuilder();
String[] splits = VIA.split("\d+\.+");
for(String split : splits){
   builder.append(split).append("\n");
}

String output = builder.toString().trim();

answered Apr 28 '14 at 20:54

Oskar Kjellin

21,280
10
54
93

there is a slight change in my problem I want to insert newline after number succeeding by '.' like 1. and 2. and 3. – user2963317 Apr 28 '14 at 21:16

score 1 · Answer 2 · 2014-04-28T21:24:24.223

1

The safest way here to do that would be go in a for loop and check if the char is a isDigit() and then adding a '\n' before adding it to the return String. Please note, I am not sure if you want to put a '\n' before the first digit.

String temp = "";
for(int i=0; i<VIA.length(); i++) {
  if(Character.isDigit(VIA.charAt(i)))
    temp += "\n" + VIA.charAt(i);
  } else {
    temp += VIA.charAt(i);
  }
}
VIA = temp;
//just use i=1 here of you want to skip the first charachter or better do a boolean check for first digit.

edited Apr 28 '14 at 21:24

answered Apr 28 '14 at 20:55

No not before the first digit. And even though it places I don't have a problem with that. – user2963317 Apr 28 '14 at 20:56
@user2963317 If you are satisfied with the answer can you please upvote my answer, thanks. – Apr 28 '14 at 21:03
error cannot invoke Isdigit on primitive type char. – user2963317 Apr 28 '14 at 21:05
My bad, you will have to use it like this Character.isDigit(VIA.charAt(i)) – Apr 28 '14 at 21:23

Inserting Newline character before every number occurring in a string?

2 Answers2

Linked