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+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * BracketExpension
+ */
+public class BracketExpension {
+  // You are given a string expression which consists of several comma separated
+  // tokens
+  // enclosed within opening ('{') and closing ('}') curly braces.
+  // The string expression might or might not have a prefix before opening curly
+  // brace('{') and
+  // a suffix after closing curly brace ('}').
+  // You have to return a list of strings as output for each comma separated item
+  // as shown below in the examples.
+  //
+  // Example 1:
+  // Input = "/2022/{jan,feb,march}/report"
+  // Output = "/2022/jan/report"
+  // "/2022/feb/report"
+  // "/2022/march/report"
+  //
+  // Example 2:
+  // Input = "over{crowd,eager,bold,fond}ness"
+  // Output = "overcrowdness"
+  // "overeagerness"
+  // "overboldness"
+  // "overfondness"
+  //
+  // Example 3:
+  // Input = "read.txt{,.bak}"
+  // Output = "read.txt"
+  // "read.txt.bak"
+
+  public static void main(String[] args) {
+    String tokens = "over{crowd,eager,bold,fond}ness";
+    String tokeneez = "/2022/{jan,feb,march}/report";
+    List<String> options = TokensListed(tokeneez);
+    for (int i = 0; i < options.size(); i++) {
+      System.out.println(options.get(i));
+    }
+  }
+
+  public static List<String> TokensListed(String str) {
+    List<String> ans = new ArrayList<>();
+    // let's find the starting and the ending of the indecies of the curly braces;
+    int startIndex = str.indexOf("{");
+    int endIndex = str.indexOf("}");
+
+    if (startIndex == -1 || endIndex == -1 || startIndex > endIndex) {
+      ans.add(str);
+      return ans;
+    }
+
+    // Extract the prefix, suffix and the options;
+    String prefix = str.substring(0, startIndex);
+    String suffix = str.substring(endIndex + 1);
+    String options = str.substring(startIndex + 1, endIndex);
+
+    // Split the options by comma
+    String[] tokens = options.split(",");
+    for (String token : tokens) {
+      ans.add(prefix + token + suffix);
+    }
+    return ans;
+  }
+}