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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.regex.*;
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String input = "Jim ate a [sandwich] with [pickles] and [dried [onions]] and ] [an[other] match]";
  13. 		List<String> balanced = getBalancedSubstrings(input, '[', ']', true);
  14. 		System.out.println("Balanced ones: " + balanced);
  15. 		List<String> rx_split = new ArrayList<String>();
  16. 		for (String item : balanced) {
  17.    			rx_split.add("\\s*" + Pattern.quote(item) + "\\s*");
  18.  		}
  19.  		String rx = String.join("|", rx_split);
  20. 		System.out.println("In-betweens: " + Arrays.toString(input.split(rx)));
  21. 	}
  22. 	public static List<String> getBalancedSubstrings(String s, Character markStart, Character markEnd, Boolean includeMarkers) {
  23. 		List<String> subTreeList = new ArrayList<String>();
  24. 		int level = 0;
  25. 		int lastOpenBracket = -1;
  26. 		for (int i = 0; i < s.length(); i++) {
  27.     		char c = s.charAt(i);
  28.     		if (c == markStart) {
  29.         		level++;
  30.         		if (level == 1) {
  31.             		lastOpenBracket = (includeMarkers ? i : i+1);
  32.         		}
  33.     		}
  34.     		else if (c == markEnd) {
  35.         		if (level == 1) {
  36.             		subTreeList.add(s.substring(lastOpenBracket, (includeMarkers ? i+1 : i)));
  37.         		}
  38.         		if (level > 0) level--;
  39.     		}
  40. 		}
  41. 		return subTreeList;
  42. 	}
  43. }
Success #stdin #stdout 0.06s 27888KB
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Balanced ones: [[sandwich], [pickles], [dried [onions]], [an[other] match]]
In-betweens: [Jim ate a, with, and, and ]]
https://ideone.com/FPLY08
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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