This program checks whether an input string can be fully constructed using words from a predefined dictionary of words.
### Key Points:
1. **Dictionary of Words**:
- A set of predefined words (like "leet", "coded", "problems") is used to form a dictionary. These words are stored in a `HashSet` to ensure quick lookup and eliminate duplicates.
2. **Input String**:
- The input string is `"leetcodeproblems"`. The program checks if this string can be entirely composed of the words in the dictionary.
3. **Regular Expression Creation**:
- A regular expression is dynamically created by joining all the words from the dictionary with a pipe symbol (`|`), which represents an OR condition in regular expressions. This allows checking for any combination of those words in the input string.
- The resulting pattern is enclosed in parentheses and followed by `*`, which means that any of these words can repeat any number of times (including zero).
4. **Pattern Matching**:
- A `Pattern` object is created using the generated regular expression, and a `Matcher` object is used to check whether the input string matches the pattern.
- The `matches()` method is used to determine if the entire input string can be broken down into the words from the dictionary.
5. **Final Output**:
- If the input string fully matches the pattern (i.e., it can be formed entirely using words from the dictionary), the program prints "Matches". Otherwise, it prints "Not Matched".
### Concept:
- The program checks if a given string can be constructed by concatenating words from a set of dictionary words, using regular expressions to perform the matching efficiently.
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