Regex Tester & Validator

This regex matches sequences of 1 to 3 characters that are either I, V, X, or a comma, followed by any single character. It is likely intended to identify short Roman numerals (such as I, II, III, IV, V, VI, VII, VIII, IX, X) that are followed by a delimiter like a period or space. Use cases include parsing numbered lists, extracting Roman numeral references, or teaching regex with simple patterns.