// The MIT License (MIT)

//

// Copyright (c) 2018 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package IDS08J;

class ReDoS {

public static void main(String[] args) {

final String a002 = "aa"; // two 'a'

final String a003 = "aaa"; // three 'a'

// 102 'a'

final String a102 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

// 103 'a'

final String a103 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";

final String ax4 = "aaaaX";

final String ax16 = "aaaaaaaaaaaaaaaaX";

final String ax32 = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaX";

System.out.println(ax4.matches("^(a+)+$"));

System.out.println(ax16.matches("^(a+)+$"));

// System.out.println(ax32.matches("^(a+)+$"));

System.out.println(a002.matches("(aa|aab?)*"));

System.out.println(a003.matches("(aa|aab?)*"));

System.out.println(a102.matches("(aa|aab?)*"));

System.out.println("++++++++++++++++++++++");

System.out.println(a103.matches("(aa|aab?)*"));

System.out.println("++++++++++++++++++++++");

}

}