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Task: Fix C Regex Validation for Digits-Only Input

Task: Fix C Regex Validation for Digits-Only Input: a task in Terminal-Lego-15k (Harbor dataset). You are working on a C application that needs to validate user input to ensure it contains only numeric digits (0-9) and nothing else. No letters, no special characters, no whitespace.

The task

You are working on a C# application that needs to validate user input to ensure it contains **only numeric digits (0-9)** and nothing else. No letters, no special characters, no whitespace.

Part of PrimeIntellect/Terminal-Lego-15k.