Part of my application I encountered this problem. The String line variable contains 12.2 Andrew and I'm trying to split them separately but it doesn't work and comes with a NumberFormatException error. Could you guys help me on that please?
String line = "12.2 Andrew";
String[] data = line.split("(?<=\\d)(?=[a-zA-Z])");
System.out.println(Double.valueOf.(data[0]));
Did you look at your data variable? It didn't split anything at all, since the condition never matches. You are looking for a place in the input immediately after a number and before a letter, and since there is a space in between this doesn't exist.
Try adding a space in the middle, that should fix it:
String[] data = line.split("(?<=\\d) (?=[a-zA-Z])");
If you print content of data[0] you will notice that it still contains 12.2 Andrew so you actually didn't split anything. That is because your regex says:
split on place which has digit before and letter after it
which for data like
123foo345bar 123 baz
effectively can only split in places marked with |
123|foo345|bar 123 baz
^it will not split `123 baz` like
`123| baz` because after digit is space (not letter)
`123 |baz` before letter is space (not digit)
so regex can't match it
What you need is to "split on space which has digit before and letter after it" so use
String[] data = line.split("(?<=\\d)\\s+(?=[a-zA-Z])");
// ^^^^ - this represent one ore more whitespaces
Your split is not working, and not splitting the String.
Therefore Double.parseDouble is parsing the whole input.
Try the following:
String line = "12.2 Andrew";
String[] data = line.split("(?<=\\d)(?=[a-zA-Z])");
System.out.println(Arrays.toString(data));
// System.out.println(Double.valueOf(data[0]));
// fixed
data = line.split("(?<=\\d).(?=[a-zA-Z])");
System.out.println(Arrays.toString(data));
System.out.println(Double.valueOf(data[0]));
Output
[12.2 Andrew]
[12.2, Andrew]
12.2
