java - How to use regular expression to format json file -

i want write text file json file using regular expressions java.

meaning want text file containing this:

5.2 hello

sentence 1. sentence 2.

to become this:

{"chapter": "5.2",   "title": "hello",   "text": "sentence 1. sentence 2."} 

i have code match fields in text file , output json, i'm not sure how break json sections need using regex.

i'm attempting this:

 pattern p = pattern.compile((\d\.\d)(.*?)(?=\d\.\d|$));  matcher m = p.matcher(readfile(text));  while(m.find()) {  obj.put("chapter", m.group());  system.out.println(obj);} 

but outputs chapter field followed rest of text. i'm not sure how split data chapter, title , text fields.

input:

5.2 hello

sentence 1. sentence 2.

current output is:

{"chapter": "5.2 hello sentence 1. sentence 2."}

but need this:

{"chapter": "5.2", "title": "hello", "text": "sentence 1. sentence 2."}

any help?

i assume input format:

5.2 hello \n

whatever text...

your way of thinking correct. since want divide original text 3 sections. need make use of border between sections. example, "5.2" , "hello" have space (\s) in bewteen, "hello" has new line (or maybe space) before main text.

you can try:

    pattern p = pattern.compile("(\\d+\\.\\d+)\\s+(.*?)\\n(.*$)");     matcher m = p.matcher(text);     if(m.find()) {         obj.put("chapter", m.group(1));         obj.put("title", m.group(2));         obj.put("text", m.group(3));         system.out.println(obj);     } 

your previous way of using group incorrect, because number of groups depends on how many pairs of bracket have pattern.compile(). since have 3 groups in total, use index value.

note: group(0) whole thing, first group accessed index 1.