将字符串拆分为单词并加倍

Question

I am writing a program to read a file that looks like this:

NODE: label Buenous Aires:x=131.3456:y=-48.783

I want the program to split each line into an array with the entries of the label, then the x value, and the y value. I have looked into using the s.split tool with regular expressions but I do not know how to store the information that I am reading in into the program.

String[] words=s.split(" ");
"NODE: label=(.+):x=(\d+):y=(\d+)";

Could someone please give me tips on how to make such an array. I am looking for the array to have 3 entries, the first the label Buenous Aires, the second the x value and the third the y value.

Answer 1

If you're not comfortable with regex, you could instead

1. Split on colons
2. Loop over those strings (start at position 1)
3. Split on equal signs
4. Extract your data

Answer 2

If you want to use split() (which is a good idea, since it can directly yield the wanted string array), you have not to specify the overall pattern of the string like you intended with "NODE: label=(.+):x=(\\d+):y=(\\d+)" , but only a delimiting expression, as :.= :

• : - ends the previous entry
• . - matches x or y
• = - preludes the next entry

---

    String s = "NODE: label=Buenous Aires:x=131.3456:y=-48.783";
    String[] words = s.substring(12).split(":.=");

The substring(12) skips the leading NODE: label= .