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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.  
  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 expression = "(x1(x2)(x3)(x4(x5(x6)(x7)))(x8))";
  13.  
  14. 		System.out.println(getSubExpression(expression, "x1", '(', ')'));
  15. 		System.out.println(getSubExpression(expression, "x2", '(', ')'));
  16. 		System.out.println(getSubExpression(expression, "x3", '(', ')'));
  17. 		System.out.println(getSubExpression(expression, "x4", '(', ')'));
  18. 		System.out.println(getSubExpression(expression, "x5", '(', ')'));
  19. 		System.out.println(getSubExpression(expression, "x6", '(', ')'));
  20. 		System.out.println(getSubExpression(expression, "x7", '(', ')'));
  21. 		System.out.println(getSubExpression(expression, "x8", '(', ')'));
  22. 	}
  23.  
  24. 	public static String getSubExpression(String expression, String search, char open, char close) {	
  25. 		int idx = expression.indexOf(open + search);
  26.  
  27. 		if (idx == -1)
  28. 			return ""; //No match.
  29.  
  30. 		int depth = 0;
  31.  
  32. 		StringBuilder builder = new StringBuilder();
  33.  
  34. 		for (int i = idx; i < expression.length(); i++) {
  35. 			char c = expression.charAt(i);
  36.  
  37. 			if (c == open) depth++;
  38. 			if (c == close) depth--;
  39.  
  40. 			builder.append(expression.charAt(i));
  41.  
  42. 			if (depth < 1) break;
  43. 		}
  44.  
  45. 		return builder.toString();
  46. 	}
  47. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
stdout
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(x1(x2)(x3)(x4(x5(x6)(x7)))(x8))
(x2)
(x3)
(x4(x5(x6)(x7)))
(x5(x6)(x7))
(x6)
(x7)
(x8)
https://ideone.com/ChtLvj
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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