获取多次出现的子字符串？

Question

String str="The colors are [blue], [yellow], and [green]";

I have seen many posts how to achieve this using regex.

Here is my for loop that keeps giving me a string out of range error:
   for (int i=0;i<str.length();i++){
      String result = str.substring(str.indexOf("[") + 1, str.indexOf("]"));
      System.out.println(result);

Answer 1

I would say you want something like that if you strictely don't want to use regex... for whatever reason. Regex will almost certainely be equally fast and the code looks much much nicer. But anyway here's a sample code how it would look like:

String str="The colors are [blue], [yellow], and [green]";

ArrayList<String> arr = new ArrayList<String>();

for(int i = str.indexOf('[', 0); i != -1; i = str.indexOf('[', i + 1)) {
    arr.add(str.substring(i + 1, str.indexOf(']', i)));
}

for(String s : arr) {
    System.out.println(s);
}