Worked on the snakemake/snakemake repository to enhance file path wildcard validation, addressing an issue where invalid wildcard names were previously truncated without user notification. Introduced a new validation mechanism using Python and regular expressions to detect unsupported characters in wildcard names, providing clear user warnings instead of silent failures. Refactored the wildcard registration process to centralize validation logic, improving maintainability and setting the stage for future extensibility. This update focused on robust error handling and delivered actionable feedback to users, reducing misconfigurations and streamlining debugging. The work improved reliability and user experience by making validation outcomes transparent and traceable.