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  1. import java.util.Random;
  2.  
  3. class Rawr {
  4. 	static class Yawn {
  5. 		StringBuilder b = new StringBuilder();
  6. 		int groups;
  7. 		boolean usedKeepYet;
  8. 		Yawn() {}
  9. 		void toss() {
  10. 			System.out.println(b);
  11. 		}
  12. 	}
  13. 	static final String[] constructs =
  14. 	{"\\s", "\\S", "\\d", "\\D", "\\w", "\\W", "^", "$", "]", "{", "}", "\\b",
  15. 	    "\\B", "\\t", "\\n", "\\r", "\\h", "\\K"};
  16. 	static final String[] quantifiers = {"*", "+", "?"};
  17. 	static final String[] groups = {"?:", "?>", "?|", "?#", "?!", "?<!", "?<="};
  18.  
  19. 	public static void main(String[] args) {
  20. 		Yawn yawn = new Yawn();
  21. 		for (Random rand = new Random(); 0 != rand.nextInt(20);)
  22. 		    addWoolTo(yawn, rand);
  23. 		yawn.toss();
  24. 	}
  25. 	static void addWoolTo(Yawn yar, Random wool) {
  26. 		switch (wool.nextInt(9)) {
  27. 			case 0:
  28. 				String thing = constructs[wool.nextInt(constructs.length)];
  29. 				if (yar.usedKeepYet && ("\\K" == thing)) {
  30. 					yar.b.append("\\s");
  31. 					return;
  32. 				} else if ("\\K" == thing)
  33. 					yar.usedKeepYet = true;
  34. 				yar.b.append(thing);
  35. 				break;
  36. 			case 1:
  37. 			case 2: // #FT#
  38. 			case 3:
  39. 				yar.b.append((char)
  40. 				    (wool.nextInt(26) + (wool.nextBoolean()? 'a' : 'A')));
  41. 				break;
  42. 			case 4:
  43. 				yar.b.append("|");
  44. 				yar.usedKeepYet = false;
  45. 				break;
  46. 			case 5:
  47. 				if (wool.nextBoolean()) {
  48. 					yar.b.append("{" + wool.nextInt(16));
  49. 					if (wool.nextBoolean())
  50. 					    yar.b.append("," + wool.nextInt(16));
  51. 					yar.b.append('}');
  52. 				} else
  53. 				    yar.b.append(quantifiers[wool.nextInt(quantifiers.length)]);
  54. 				if (wool.nextInt(4) == 0)
  55. 				    yar.b.append(wool.nextBoolean() ? '+' : '?');
  56. 				break;
  57. 			case 6:
  58. 			case 7:
  59. 				yar.b.append('(');
  60. 				if ((yar.groups != 0) && wool.nextInt(8) == 0)
  61. 				   yar.b.append("?(" + (1 + wool.nextInt(yar.groups - 1)) +")");
  62. 				else if (wool.nextInt(3) == 0) {
  63. 				   yar.b.append(groups[wool.nextInt(groups.length)]);
  64. 				} else yar.groups++;
  65. 				while (0 != wool.nextInt(4))
  66. 					addWoolTo(yar, wool);
  67. 				yar.b.append(')');
  68. 				break;
  69. 			case 8:
  70. 				yar.b.append(wool.nextInt(10));
  71. 		}
  72. 	}
  73. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
stdout
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p(?!)\Wj??L(|)y(?!aggO{0,4}8){2,2}f\h(u3(s\w)\b())(0})3v{15}?7Fum(\w)rO()I(S(F|{5,1}|(?(3)()(?(7)(?(7)\h(?:0))()p(?|({))|xM{2,2}+)()())))UBb(?>\WHUT+F(?:)|A(?#\wh)(?!)N){4}+\d*+FS
https://ideone.com/EeEvZ3
language:
Java (12.0.1)
created:
9 years ago
visibility:
secret

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