Developed a lightweight Python utility for the Odin2325/TQ5Juli repository that performs input string pattern validation to support downstream text processing. The solution uses conditional logic and string manipulation to check if a string ends with a period, ends with the substring 'r!', or starts with 'Hallo', returning a Boolean result accordingly. This early validation step helps improve data quality and reduces potential errors in subsequent processing stages. The implementation relied on efficient string slicing and indexing techniques. A corrective commit was applied to refine the logic and ensure consistent output, maintaining a focused and clean version control history throughout the project.